Trial Chambers

Trial chambers^{[note 1]} are uncommon underground structures that serve as a mid-game combat challenge.^[1] They consist mostly of copper blocks and tuff bricks, and are the only place where trial spawners and vaults naturally generate. Trial chambers are also the only place where breezes spawn, whose breeze rods can be used to craft wind charges. Various materials such as heavy cores and certain armor trims are obtained exclusively by unlocking vaults in trial chambers. As it is the only source of breeze rods and heavy cores, the structure is also the only location where maces can be obtained.

Trial chambers can also be used to obtain copper bulbs without entering the Nether, and large quantities of copper blocks and their derivatives.

Ominous trials can also take place here through the Bad Omen effect. Bad Omen converts to Trial Omen, which causes all trial spawners to become ominous, making them more difficult and providing greater rewards.

Trial chambers generate underground in the Overworld. The starting room generates at an altitude of between Y=-40 and -20, but the structure is not restricted to those Y levels; the majority of the structure's rooms tend to generate between Y=-20 and 0.^[verify]

Trial chambers can only generate in new chunks, specifically ones that did not exist prior to Java Edition 1.21 and Bedrock Edition 1.21.0.

The generation of trial chambers follows a grid of 34×34 chunk regions centered on the world origin (X=0, Z=0). There is always one trial chambers structure generated in each region at a random location, unless a deep dark biome cancels the generation of the trial chambers.

While the origin point of the structure (corridor_end) cannot generate within a deep dark biome, other parts of it can intersect a deep dark biome.

Trial chambers can be located using trial explorer maps, which can be obtained in one​^{[until: Third Drop 2026]} or two​^{[upcoming: Third Drop 2026]} way(s).

• Trial explorer maps are sold by journeyman-level cartographer villagers for 12 emeralds and a compass. The maps always point to the nearest trial chamber relative to the cartographer that does not already have a trial explorer map that points to it. All maps bought from the same cartographer always point to the same structure.
• Trial explorer maps can be found in loot of secret chests in abandoned camps.​^{[upcoming: Third Drop 2026]} (see Abandoned Camps § Secret chests).

Trial chambers are buried underground, so exposed caves will usually have weird shapes that will determine the location of a trial chamber.

In Java Edition, a given villager always trades the same map, which is determined upon the trade unlocking.

An online seed map such as mcseedmap.net or chunkbase.com may be used instead.

The starting room of the structure is corridor/end. This room connects to a chamber and a section of a corridor. At the end of the section of a corridor, an intersection links to another chamber and another section of a corridor is generated, but this time it ends on the atrium, which then leads to the entrance room.

The structure then branches out from some corridor/straight pieces.

All trial chambers structures found below are located in the folder client.jar/data/minecraft/structure/trial_chambers‌^{[JE only]} or data/behavior_packs/vanilla/structures/trial_chambers‌^{[BE only]}.

List

This is a list of blocks (and loot sources) that can generate in trial chambers within its substructures.

Trial chambers feature two corridors:

• a corridor going from the entrance room to the intersection, passing through four slices and the atrium;
• a corridor going from the intersection to the end room, passing through four slices.

The intersection connects both corridors, forming an L-shape. The intersection and the end room always lead to a chamber, while slices have a probability to lead to a hallway (see § Hallways).

The entrance generates at the end of one of the two corridors, passing through the atrium.

entrance_1 and entrance_2 include a vault, two entrance chests, and a platform containing either an oak, a mangrove, or a cactus; additionally, entrance_1 has a secret room containing a bed and a chest.

entrance_3 includes two vaults and three entrance chests.

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/corridor/entrance_1	Entrance 1 is a two-story room. The first floor features a walkway, above which is a copper grate that leading to a hidden room containing a bed and a chest. A staircase leads to the second floor. The connector to the atrium is found at this floor. The second floor contains a platform with a tree (either an oak, a mangrove or cactus) and two chests. Between the two chests, right next to the vegetation platform, is a trapdoor leading into a ventilation-shaft-like tunnel. This tunnel connects both floors. The second floor also features an upper ledge with a vault.	3619 Tuff Bricks 343 Waxed Block of Copper 279 Polished Tuff 238 Chiseled Tuff Bricks 197 Waxed Oxidized Copper 89 Waxed Oxidized Cut Copper 31 Chiseled Tuff 27 Waxed Copper Bulb 15 Waxed Oxidized Cut Copper Stairs 14 Waxed Copper Grate 3 Waxed Chiseled Copper 3 Chest[note 6] 1 Oxidized Copper Trapdoor 1 Purple Bed 1 Waxed Copper Door 1 Waxed Oxidized Chiseled Copper 1 Waxed Oxidized Copper Trapdoor		1⁄3 (33.33%)
trial_chambers/corridor/entrance_2	Entrance 2 is a two-story room. The first floor is empty. A staircase leads to the second floor. The second floor contains a platform with a tree (either an oak, a mangrove or cactus) and two chests. It also features an upper ledge with a vault. The connector to the atrium is found at the second floor.	3599 Tuff Bricks 326 Waxed Block of Copper 313 Waxed Oxidized Copper 262 Chiseled Tuff Bricks 231 Chiseled Tuff 56 Waxed Oxidized Cut Copper 32 Waxed Copper Bulb 23 Waxed Oxidized Cut Copper Stairs 2 Chest 2 Waxed Chiseled Copper 1 Waxed Oxidized Chiseled Copper		1⁄3 (33.33%)
trial_chambers/corridor/entrance_3	Entrance 3 is a five-story room with two spiral staircases that intertwine with one another but never connect; each staircase leads to separate sections of each floor, preventing traversal between them even on the same level. The first spiral staircase goes from the first floor to the last floor. The first floor features two chests and the third floor a third chest, while other sections of floors connected by the first spiral staircase are empty. The second spiral staircase goes from the second floor to the last floor. The fourth and fifth floor both feature a vault. The first floor features the connector to the atrium.	4363 Tuff Bricks 471 Polished Tuff 413 Waxed Block of Copper 406 Waxed Oxidized Copper 98 Chiseled Tuff Bricks 69 Waxed Oxidized Cut Copper Stairs 44 Waxed Copper Bulb 12 Waxed Cut Copper Stairs 4 Waxed Oxidized Cut Copper 3 Chest 3 Waxed Chiseled Copper 3 Waxed Copper Grate 1 Waxed Oxidized Chiseled Copper		1⁄3 (33.33%)
Addons
trial_chambers/corridor/addon/display_1	These substructures are the trees that can generate in entrance_1 and entrance_2. They cannot generate in entrance_3. They are respectively an oak, a mangrove and a cactus.	25 Oak Leaves 24 Waxed Oxidized Cut Copper 6 Waxed Block of Copper 4 Waxed Chiseled Copper 3 Oak Log 1 Dirt 1 Water		1⁄3 (33.33%)
trial_chambers/corridor/addon/display_2		24 Mangrove Leaves 23 Vines 19 Waxed Oxidized Cut Copper 16 Tuff Bricks 8 Waxed Block of Copper 4 Waxed Chiseled Copper 3 Mangrove Log 3 Mangrove Roots 2 Mangrove Wood 2 Mud 1 Moss Carpet 1 Muddy Mangrove Roots 1 Water		1⁄3 (33.33%)
trial_chambers/corridor/addon/display_3		23 Waxed Oxidized Cut Copper 12 Tuff Bricks 8 Waxed Block of Copper 4 Sand 4 Waxed Chiseled Copper 2 Cactus 1 Dead Bush		1⁄3 (33.33%)

The atrium generates between the entrance and one of the corridor's slices. It always contains an ominous vault above the doorway leading to the entrance and a fountain.

Murals are generated on both sides; they can depict either a bogged, a breeze, a spider, or a spiral shape. The grand staircase is also chosen randomly.

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/corridor/atrium_1	Atrium 1 is a large room featuring a grand bifurcated staircase connected to the entrance, a fountain, two murals, and ladders connecting the surface level to the lower, middle and upper level of the corridor. The grand staircase design and the murals are chosen randomly and are not part of the structure's pre-generation.	2667 Tuff Bricks 334 Polished Tuff 236 Waxed Block of Copper 189 Waxed Oxidized Copper 129 Chiseled Tuff Bricks 84 Waxed Copper Grate 78 Waxed Oxidized Cut Copper 22 Chiseled Tuff 19 Waxed Copper Bulb 13 Ladder 12 Waxed Oxidized Cut Copper Stairs 9 Water		1⁄1 (100%)
Addons (grand staircase)
trial_chambers/corridor/atrium/grand_staircase_1	The grand staircase designs. grand_staircase_3's copper blocks is unwaxed due to a bug.	330 Tuff Bricks 59 Waxed Oxidized Copper 42 Waxed Oxidized Cut Copper Stairs 29 Waxed Block of Copper 27 Waxed Oxidized Cut Copper 16 Chiseled Tuff Bricks 3 Polished Tuff 2 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/corridor/atrium/grand_staircase_2		110 Tuff Bricks 79 Waxed Oxidized Copper 24 Waxed Oxidized Cut Copper 24 Waxed Oxidized Cut Copper Stairs 15 Waxed Block of Copper 2 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/corridor/atrium/grand_staircase_3		150 Tuff Bricks 75 Waxed Oxidized Copper 28 Waxed Oxidized Cut Copper Stairs 25 Waxed Oxidized Cut Copper 20 Block of Copper[2] 6 Chiseled Tuff Bricks 1 Chiseled Tuff 1 Waxed Copper Bulb		1⁄3 (33.33%)
Addons (mural)
trial_chambers/corridor/atrium/bogged_relief	The mural designs. They are respectively depicting a bogged, a breeze, a spider, and a spiral shape.	497 Tuff Bricks 38 Polished Tuff 32 Waxed Block of Copper 27 Chiseled Tuff Bricks 21 Waxed Oxidized Cut Copper 21 Waxed Oxidized Copper 14 Mossy Cobblestone 10 Chiseled Tuff 6 Waxed Copper Bulb 4 Waxed Oxidized Copper Grate 4 White Concrete 3 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)
trial_chambers/corridor/atrium/breeze_relief		496 Tuff Bricks 38 Polished Tuff 34 Chiseled Tuff Bricks 32 Waxed Block of Copper 25 Waxed Oxidized Cut Copper 21 Waxed Oxidized Copper 12 Chiseled Tuff 8 White Stained Glass 4 Black Stained Glass 4 Waxed Copper Bulb 3 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)
trial_chambers/corridor/atrium/spider_relief		645 Tuff Bricks 38 Polished Tuff 32 Waxed Block of Copper 29 Chiseled Tuff Bricks 21 Waxed Oxidized Cut Copper 21 Waxed Oxidized Copper 16 Red Concrete 6 Waxed Copper Bulb 4 Black Stained Glass 4 Waxed Oxidized Copper Grate 4 Chiseled Tuff 4 White Stained Glass 3 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)
trial_chambers/corridor/atrium/spiral_relief		512 Tuff Bricks 78 Polished Tuff 32 Waxed Block of Copper 24 Chiseled Tuff Bricks 21 Waxed Oxidized Copper 21 Waxed Oxidized Cut Copper 6 Waxed Copper Bulb 4 Waxed Oxidized Copper Grate 4 Chiseled Tuff 3 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)

Corridor slices, or straight pieces,^{[note 7]} are sub-structures that make up the corridors; they are generated on top of a tuff brick plate. Each of the two corridors has four slices.

Except for straight_1 and straight_8, all slices have a copper door:

• straight_2 and straight_5 generate a copper door on the lower level;
• straight_3 and straight_6 generate a copper door on the middle level;
• straight_4 and straight_7 generate a copper door on the upper level.

On average, each trial chamber has 6.29 (⁴⁴⁄₇) doors. These copper doors can either lead directly to a chamber, a hallway or nothing.^[3] Provided the latter case doesn't happen:

• lower level doors always lead to a descending spiral staircase (lower_hallway_connector or trapped_staircase);
• upper level doors always lead to an ascending spiral staircase (upper_hallway_connector);
• middle level doors and these spiral staircases have a 97.48% chance to directly lead to a chamber, 2.44% chance to lead to a hallway piece, and 0.08% chance to directly lead to a dead-end (see § Hallways).

Both straight_6 and straight_8 generate with a trial spawner that can either spawn a melee, small melee or ranged mob (see § Mobs), but never breezes. straight_7 generates with a hidden vault.

In addition to their addons, slices can generate with various decorations such as flower pots, decorated pots, candles and corridor barrels (see § Decor). Some addons can generate with a trial spawner (that can either spawn a melee, small melee or ranged mob) and a vault.

Name	Description	Blocks	Image[note 5]	Weight
Slices
trial_chambers/corridor/straight_1	straight_1 does not generate with a copper door.	667 Tuff Bricks 110 Polished Tuff 69 Waxed Oxidized Copper 68 Waxed Block of Copper 66 Chiseled Tuff Bricks 44 Waxed Oxidized Cut Copper 26 Waxed Copper Grate 8 Chiseled Tuff 8 Waxed Copper Bulb		1⁄14 (7.14%)
trial_chambers/corridor/straight_2	straight_2 generates with a copper door on the lower level.	629 Tuff Bricks 108 Polished Tuff 95 Waxed Block of Copper 72 Waxed Oxidized Copper 61 Chiseled Tuff Bricks 46 Waxed Oxidized Cut Copper 26 Waxed Copper Grate 9 Waxed Copper Bulb 6 Chiseled Tuff 2 Waxed Oxidized Cut Copper Stairs 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		2⁄14 (14.28%)
trial_chambers/corridor/straight_3	straight_3 generates with a copper door on the middle level. Additionally, one of its upper level sides is blocked by a wall.	844 Tuff Bricks 93 Waxed Block of Copper 86 Polished Tuff 85 Chiseled Tuff Bricks 54 Waxed Oxidized Copper 41 Waxed Oxidized Cut Copper 16 Waxed Copper Grate 7 Waxed Copper Bulb 4 Chiseled Tuff 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		2⁄14 (14.28%)
trial_chambers/corridor/straight_4	straight_4 generates with a copper door on the upper level.	629 Tuff Bricks 107 Polished Tuff 96 Waxed Block of Copper 69 Waxed Oxidized Copper 59 Chiseled Tuff Bricks 48 Waxed Oxidized Cut Copper 26 Waxed Copper Grate 9 Waxed Copper Bulb 8 Chiseled Tuff 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		2⁄14 (14.28%)
trial_chambers/corridor/straight_5	straight_5 generates with a copper door on the lower level.	630 Tuff Bricks 107 Polished Tuff 95 Waxed Block of Copper 69 Waxed Oxidized Copper 61 Chiseled Tuff Bricks 47 Waxed Oxidized Cut Copper 27 Waxed Copper Grate 9 Waxed Copper Bulb 6 Chiseled Tuff 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		2⁄14 (14.28%)
trial_chambers/corridor/straight_6	straight_6 generates with a copper door on the middle level and a trial spawner on the lower level.	595 Tuff Bricks 107 Polished Tuff 90 Waxed Block of Copper 79 Waxed Oxidized Copper 62 Chiseled Tuff Bricks 48 Waxed Oxidized Cut Copper 14 Waxed Copper Grate 8 Waxed Oxidized Cut Copper Stairs 6 Chiseled Tuff 6 Waxed Copper Bulb 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		2⁄14 (14.28%)
trial_chambers/corridor/straight_7	straight_7 generates with a copper door on the upper level. Additionally, one of its upper level sides is blocked by a wall containing a vault hidden[note 8] inside of the wall.	779 Tuff Bricks 102 Polished Tuff 91 Waxed Block of Copper 78 Chiseled Tuff Bricks 61 Waxed Oxidized Copper 44 Waxed Oxidized Cut Copper 15 Waxed Copper Grate 12 Chiseled Tuff 7 Waxed Copper Bulb 2 Waxed Chiseled Copper 1 Waxed Oxidized Copper Door		1⁄14 (7.14%)
trial_chambers/corridor/straight_8	straight_8 does not generate with a copper door but generates with a trial spawner on the middle level.	715 Tuff Bricks 117 Polished Tuff 88 Waxed Oxidized Copper 70 Chiseled Tuff Bricks 70 Waxed Block of Copper 36 Waxed Oxidized Cut Copper 17 Waxed Copper Grate 10 Chiseled Tuff 6 Waxed Copper Bulb		2⁄14 (14.28%)
trial_chambers/corridor/first_plate trial_chambers/corridor/second_plate	This substructure is a technical piece. It serves as the foundation for the 4 slices of each corridor.	380 Tuff Bricks		1⁄1 (100%)
Addons (lower)[note 9]
trial_chambers/corridor/addon/staircase	This addon is a staircase connecting the surface level to the lower level.	3 Chiseled Tuff Bricks 2 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Bulb 1 Waxed Block of Copper 1 Waxed Oxidized Cut Copper		1⁄14 (7.14%)
trial_chambers/corridor/addon/wall	This addon is a wall blocking off the surface level.	220 Tuff Bricks 10 Waxed Oxidized Cut Copper		1⁄14 (7.14%)
trial_chambers/corridor/addon/ladder_to_middle	This addon is a ladder linking the lower level to the middle level.	10 Waxed Block of Copper 7 Waxed Oxidized Cut Copper 6 Ladder 6 Polished Tuff 5 Tuff Bricks 4 Chiseled Tuff Bricks 2 Chiseled Tuff 2 Waxed Chiseled Copper 1 Waxed Copper Bulb		1⁄14 (7.14%)
trial_chambers/corridor/addon/arrow_dispenser	This addon is a dispenser trap that can be triggered with tripwire hooks.	12 Waxed Block of Copper 10 Tuff Bricks 10 Waxed Oxidized Cut Copper 10 Tripwire 8 Chiseled Tuff Bricks 4 Tripwire Hook 2 Waxed Copper Bulb 1 Chiseled Tuff 1 Dispenser (4-8 Arrow)		1⁄14 (7.14%)
minecraft:trial_chambers/corridor/addon/bridge_lower	This addon is a bridge linking the two sides of the slice on the lower level and linked to the surface level.	23 Waxed Oxidized Copper 17 Waxed Oxidized Cut Copper 14 Chiseled Tuff Bricks 12 Waxed Oxidized Cut Copper Stairs 10 Tuff Bricks 8 Waxed Block of Copper		2⁄14 (9.09%)
Addons (middle)
trial_chambers/corridor/addon/open_walkway	This addon is a copper grate walkway linking the two sides of the slice on the middle level. It generates with a trial spawner.	31 Tuff Bricks 21 Polished Tuff 9 Waxed Copper Grate 9 Chiseled Tuff Bricks 6 Waxed Block of Copper		2⁄11 (18.18%)
trial_chambers/corridor/addon/walled_walkway	This addon is a walkway linking the two sides of the slice on the middle level, with its sides blocked by walls. It generates with a trial spawner.	58 Tuff Bricks 30 Chiseled Tuff Bricks 15 Polished Tuff 10 Waxed Block of Copper 10 Waxed Oxidized Cut Copper 5 Waxed Oxidized Copper 2 Waxed Copper Bulb		1⁄11 (33.33%)
Addons (middle upper)
trial_chambers/corridor/addon/open_walkway_upper	This addon is a copper grate walkway linking the two sides of the slice on the upper level. It generates with a trial spawner.	9 Waxed Copper Grate 6 Waxed Block of Copper 12 Iron Chain		2⁄12 (16.67%)
trial_chambers/corridor/addon/chandelier_upper	This addon is a decoration that may generate on the upper level.	3 Iron Chain 1 Waxed Copper Bulb		1⁄12 (8.33%)
trial_chambers/corridor/addon/decoration_upper	This addon is a copper grate platform linking the two sides of the slice on the upper level.	8 Waxed Copper Grate 3 Iron Chain 1 Waxed Chiseled Copper		1⁄12 (8.33%)
trial_chambers/corridor/addon/head_upper	This addon is a decoration that may generate on the upper level.	4 Waxed Copper Grate 4 Waxed Block of Copper 2 Iron Chain 1 Waxed Chiseled Copper		1⁄12 (8.33%)
trial_chambers/corridor/addon/reward_upper	This addon is a copper grate platform linking the two sides of the slice on the upper level. It generates with a vault.	10 Iron Chain 5 Waxed Chiseled Copper 4 Waxed Block of Copper		1⁄12 (8.33%)

The end room generates at the end of one of the two corridors. It always leads to one of these chambers with equal probability:

• chamber_1
• eruption
• assembly
• slanted

End rooms cannot lead to any other chamber, i.e. it excludes:

• chamber_2
• pedestal
• chamber_4
• chamber_8

End rooms always include an ominous vault. In addition to its ominous vault, end_2 also features a regular vault and an chest with intersection loot.

Name	Description	Blocks	Image	Weight
trial_chambers/corridor/end_1	End 1 is a large room with two staircases leading up to the chamber. The two staircases are separated by a wall on which an ominous vault is placed.	3087 Tuff Bricks 265 Polished Tuff 230 Waxed Block of Copper 185 Waxed Oxidized Copper 170 Chiseled Tuff Bricks 111 Waxed Oxidized Cut Copper 42 Waxed Oxidized Cut Copper Stairs 23 Waxed Copper Grate 19 Waxed Copper Bulb 7 Waxed Chiseled Copper 2 Chiseled Tuff 1 Waxed Cut Copper		1⁄2 (50%)
trial_chambers/corridor/end_2	End 2 is a large room with a staircase leading up to the chamber. The staircase goes through four pillars linked by a copper grate ring on which a vault is placed. A shallow water pool generates on the lower level. It contains a chest and an ominous vault in a room sealed by copper grates bellow the bridge leading up to the chamber.	2714 Tuff Bricks 337 Waxed Block of Copper 265 Polished Tuff 237 Waxed Oxidized Copper 211 Chiseled Tuff Bricks 83 Waxed Copper Grate 62 Waxed Oxidized Cut Copper 60 Water 56 Waxed Oxidized Cut Copper Stairs (23 waterlogged) 17 Waxed Copper Bulb 5 Waxed Chiseled Copper 1 Chest 1 Waxed Oxidized Cut Copper Slab		1⁄2 (50%)

The intersection is the room that connects both corridors. It always features a safer zone equipped with beds as well as an entrance to a chamber (rarely a hallway, see § Hallways for more information about the hallway generation rules.). In addition to that:

• intersection_1 and intersection_2 feature an ominous vault;
• intersection_2 and intersection_3 feature an barrel with loot;
• intersection_2 features a secret room with an additional bed and a decorated pot always containing 3 strings.^[4]

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/intersection/intersection_1	Intersection 1 connects the two corridors by their upper levels. The two corridors and the chamber intersection 1 links to are connected by bridges connected to a platform above a pool of deep water. The bedroom is located in the middle of the water pool, underneath the platform where the bridges are linked to. An ominous vault is sealed by a wall next to the bedroom.	4117 Tuff Bricks 966 Water 429 Waxed Block of Copper 388 Polished Tuff 311 Waxed Oxidized Copper 303 Chiseled Tuff Bricks 111 Light Gray Stained Glass 65 Waxed Oxidized Cut Copper Stairs 53 Ladder 38 Waxed Oxidized Cut Copper 33 Waxed Oxidized Copper Grate 33 Waxed Copper Grate 27 Waxed Copper Bulb 12 Waxed Chiseled Copper 9 Chiseled Tuff 2 Iron Chain		1⁄3 (33.33%)
trial_chambers/intersection/intersection_2	Intersection 2 connects the two corridors by their surface levels. The two corridors and the chamber intersection 2 links to are connected by a small atrium. The bedroom is located on a mezzanine and contains a barrel. An ominous vault is placed near the staircase leading to the bedroom. A secret chamber is hidden behind the wall at the back of the 2 beds on the left. The secret chamber contains a purple bed, a decorated pot containing 3 strings, a table, a crafting table, and a potted dead bush.	6553 Tuff Bricks 379 Polished Tuff 358 Waxed Block of Copper 274 Chiseled Tuff Bricks 260 Waxed Oxidized Copper 75 Waxed Oxidized Cut Copper 51 Waxed Copper Grate 44 Ladder 29 Waxed Copper Bulb 29 Waxed Oxidized Cut Copper Stairs 24 Waxed Oxidized Copper Grate 8 Waxed Chiseled Copper 2 Oak Slab 1 Decorated Pot 1 Crafting Table 1 Oak Pressure Plate 1 Oak Fence 1 Barrel 1 Purple Bed 1 Waxed Copper Door 1 Potted Dead Bush		1⁄3 (33.33%)
trial_chambers/intersection/intersection_3	Intersection 3 is a tall vertical room. The top of the intersection connects through the second section of the corridor (i.e. the one leading to the entrance), while the bottom of it connects through the first section of the corridor (i.e. the one leading to the end room). The chamber intersection 3 links to is found at the bottom, blocked by a copper grate wall. The center is filled up by a tall tower with three levels: the upper level connects to the second corridor, the middle level contains 3 beds and a barrel, and the lower level is a copper grate walkway leading to nothing. Unlike the other two intersections, this intersection doesn't contain an ominous vault.	7934 Tuff Bricks 552 Waxed Block of Copper 474 Chiseled Tuff Bricks 462 Polished Tuff 343 Waxed Oxidized Copper 218 Waxed Oxidized Cut Copper 102 Waxed Copper Grate 49 Waxed Copper Bulb 44 Ladder 36 Waxed Oxidized Cut Copper Stairs 14 Waxed Oxidized Copper Grate 6 Waxed Chiseled Copper 1 Barrel		1⁄3 (33.33%)

Hallways are segments that connect corridors to chambers. When a copper door generates in a corridor, it (or, in the case of an upper or lower door, the spiral staircase that follows it; see § Slices) may lead to one of the following pieces:

• a chamber (97.48%);
• a hallway segment (1.14%);
• an encounter (0.41%);‌^{[Java Edition only]}
• a dead end (0.08%).

If the selected piece cannot be generated, the game attempts to generate a different piece. After a certain number of failed attempts, it defaults to generating a dead end.​^{[more information needed]} If the dead end itself cannot be generated, no piece is generated.^[3]

This process is then repeated at the end of each hallway segment or encounter. Furthermore, hallways never branch, meaning that every copper door found in corridors eventually leads to a single chamber, a dead end, or nothing.

Name	Description	Blocks	Image	Weight
Hallway segments
trial_chambers/hallway/cache_1	These pieces constitute the various trial chamber hallways.	344 Tuff Bricks 60 Polished Tuff 51 Waxed Oxidized Copper 45 Waxed Block of Copper 40 Chiseled Tuff Bricks 4 Waxed Chiseled Copper 4 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/corridor_connector_1		48 Tuff Bricks 9 Polished Tuff 9 Waxed Oxidized Copper 6 Chiseled Tuff Bricks 6 Waxed Block of Copper		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/left_corner		78 Tuff Bricks 15 Waxed Oxidized Copper 15 Polished Tuff 10 Chiseled Tuff Bricks 10 Waxed Block of Copper 2 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/right_corner				JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/straight		78 Tuff Bricks 15 Waxed Oxidized Copper 15 Polished Tuff 10 Chiseled Tuff Bricks 10 Waxed Block of Copper 2 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/straight_staircase		111 Tuff Bricks 15 Polished Tuff 14 Waxed Block of Copper 9 Waxed Oxidized Cut Copper Stairs 9 Chiseled Tuff Bricks 7 Waxed Oxidized Copper 2 Waxed Copper Bulb 2 Waxed Chiseled Copper 2 Waxed Oxidized Cut Copper		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/straight_staircase_down				JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/long_straight_staircase		393 Tuff Bricks 36 Waxed Block of Copper 30 Polished Tuff 24 Waxed Oxidized Cut Copper Stairs 20 Chiseled Tuff Bricks 8 Waxed Chiseled Copper 7 Waxed Oxidized Copper 3 Chiseled Tuff 3 Waxed Copper Bulb 2 Waxed Oxidized Cut Copper		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/long_straight_staircase_down				JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/corner_staircase		140 Tuff Bricks 31 Waxed Block of Copper 26 Chiseled Tuff Bricks 17 Polished Tuff 14 Waxed Oxidized Copper 5 Waxed Oxidized Cut Copper Stairs 2 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/corner_staircase_down		138 Tuff Bricks 32 Waxed Block of Copper 27 Chiseled Tuff Bricks 17 Polished Tuff 14 Waxed Oxidized Copper 5 Waxed Oxidized Cut Copper Stairs 2 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/upper_hallway_connector	This piece is always connected to a corridor upper level door (see § Slices).	400 Tuff Bricks 51 Waxed Oxidized Copper 44 Waxed Block of Copper 42 Chiseled Tuff Bricks 39 Polished Tuff 7 Waxed Oxidized Cut Copper Stairs 4 Waxed Oxidized Cut Copper 3 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/lower_hallway_connector	This piece is always connected to a corridor lower level door (see § Slices).	532 Tuff Bricks 52 Waxed Oxidized Copper 48 Polished Tuff 44 Waxed Block of Copper 42 Chiseled Tuff Bricks 10 Waxed Oxidized Cut Copper Stairs 6 Waxed Oxidized Cut Copper 3 Waxed Copper Bulb		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/trapped_staircase	A variant of lower_hallway_connector. This piece is always connected to a corridor lower level door (see § Slices). In addition to that, it has pointed dripstone and ladders at the bottom of the substructure.	632 Tuff Bricks 52 Waxed Oxidized Copper 48 Polished Tuff 44 Waxed Block of Copper 42 Chiseled Tuff Bricks 10 Waxed Oxidized Cut Copper Stairs 9 Ladder 5 Waxed Oxidized Cut Copper 3 Waxed Copper Bulb 2 Pointed Dripstone		JE: 1⁄1231 (0.08%) BE: ?
Entrance caps
trial_chambers/chamber/entrance_cap	A substructure used to block all other potential entrances of a chamber after one entrance has been chosen to connect to another substructure. (See § Chambers for a list of substructures where the chamber entrance connects to.)	15 Tuff Bricks 5 Waxed Block of Copper 5 Chiseled Tuff Bricks		1⁄1 (100%)
Dead ends
trial_chambers/hallway/rubble	These pieces have a small chance of generating in hallways, stopping the hallway's expansion and acting as a dead end. They also generate as fallback pieces: during the generation, after a certain number of failed attempts at generating other pieces, it defaults to generating a dead end. In that case, the weight is 1⁄4 (25%) for all four pieces.	61 Tuff Bricks 12 Waxed Oxidized Copper 12 Polished Tuff 12 Cobbled Deepslate 9 Waxed Oxidized Copper Grate 9 Waxed Block of Copper 8 Chiseled Tuff Bricks 2 Waxed Copper Bulb 1 Chest		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/rubble_chamber				JE: 10⁄1231 (0.08%) BE: ?
trial_chambers/hallway/rubble_chamber_thin		16 Tuff Bricks 6 Waxed Block of Copper 5 Waxed Copper Grate 3 Waxed Oxidized Copper 3 Polished Tuff 2 Chiseled Tuff Bricks		JE: 1⁄1231 (0.08%) BE: ?
trial_chambers/hallway/rubble_thin				JE: 1⁄1231 (0.08%) BE: ?

Encounters are hallway pieces that consist in "short challenges leading to a larger chamber".^[6] They feature a single trial spawner and a vault.

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/hallway/encounter_1	Encounter 1 is a two-story room whose second floor has a vault and a trial spawner. The trial spawner can generate either melee, small melee or ranged mobs.	771 Tuff Bricks 188 Polished Tuff 164 Waxed Block of Copper 145 Chiseled Tuff Bricks 126 Waxed Oxidized Copper 37 Waxed Oxidized Cut Copper 18 Waxed Copper Bulb 15 Waxed Oxidized Cut Copper Stairs		1⁄1231 (0.08%)
trial_chambers/hallway/encounter_2	Encounter 2 is a two-story room whose first floor has a vault and a breeze trial spawner. Dispensers may generate in the first floor walls.	981 Tuff Bricks 110 Polished Tuff 108 Waxed Block of Copper 102 Chiseled Tuff Bricks 79 Waxed Oxidized Copper 22 Waxed Oxidized Cut Copper 14 Waxed Copper Bulb		1⁄1231 (0.08%)
trial_chambers/hallway/encounter_3	Encounter 3 is a tall vertical room whose first floor has a vault and which contains a trial spawner near the top. The trial spawner can generate either melee, small melee or ranged mobs.	1061 Tuff Bricks 121 Waxed Block of Copper 83 Chiseled Tuff Bricks 52 Polished Tuff 27 Waxed Oxidized Copper 11 Waxed Copper Bulb 10 Waxed Copper Grate 9 Waxed Oxidized Cut Copper		1⁄1231 (0.08%)
trial_chambers/hallway/encounter_4	Encounter 4 is a tall vertical room whose first floor is filled with pointed dripstones and contains a vault. The top floor contains a trial spawner that generate slow ranged mobs and a dispenser trap. Players must cross the room by performing parkour on copper grates.	2872 Tuff Bricks 446 Waxed Block of Copper 378 Chiseled Tuff Bricks 132 Polished Tuff 100 Pointed Dripstone 56 Waxed Copper Bulb 36 Waxed Copper Grate 21 Waxed Oxidized Copper 7 Ladder 3 Tripwire 2 Tripwire Hook 2 Dispenser 1 Redstone Dust		1⁄1231 (0.08%)
trial_chambers/hallway/encounter_5	Encounter 5 is a large room which contains a vault and a breeze trial spawner. The room is filled with decor and can generate dispenser in the walls.	2543 Tuff Bricks 288 Polished Tuff 210 Waxed Oxidized Copper 153 Waxed Block of Copper 138 Chiseled Tuff Bricks 44 Waxed Oxidized Cut Copper 16 Waxed Copper Bulb 10 Waxed Oxidized Cut Copper Stairs		1⁄1231 (0.08%)

Chambers are large combat rooms that contain multiple trial spawners and vaults, as well as one ominous vault. Chambers can be accessed from hallways, intersections, end rooms, and corridor slices.

Each chamber design has several potential entrances, of which only one is connected to the rest of the structure. The remaining entrances are sealed with an entrance cap (see § Hallways). Each potential entrance, including the sealed ones, generates a disposal consisting of a hopper placed above a barrel (see § Decor), allowing players to manage their inventory before entering a chamber.^[7]

Chamber_1 and Chamber_2

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/chamber_1	Chamber_1 is a large room which has a tall column in its center. It has one potential entrance on each of its four faces; three on an upper level and one on a middle level. During pre-generation, the room is a large room with no features despite walls, entrances and jigsaw blocks that can make up the features in this room, as all other features are addons that are generated via jigsaws. It generates a breeze trial spawner as part of the column. Additionally, it can generate up to two ranged trial spawners as part of walkways. It tries to generate an ominous vault embedded in a wall near the bottom of the column,[note 10] and can generate up to two regular vaults as part of walkways. In addition to its addons, dispensers may generate embedded in the walls.	4252 Tuff Bricks 494 Waxed Block of Copper 492 Polished Tuff 426 Waxed Oxidized Copper 367 Chiseled Tuff Bricks 58 Waxed Oxidized Cut Copper 35 Waxed Copper Bulb 8 Oxidized Cut Copper		JE: 150⁄1231 (12.19%) BE: ?
trial_chambers/chamber/chamber_2	Chamber_2 is a large room which has a tall column in its center and a floor made of powder snow. It has one potential entrance on each of its four faces; three on an upper level and one on a middle level. It generates a ranged trial spawner as part of the column. Additionally, it and can generate up to two ranged trial spawners as part of walkways. It generates an ominous vault as part of the column, on its lower level, and can generate up to two regular vaults as part of walkways. In addition to its addons, dispensers may generate embedded in the walls.	4868 Tuff Bricks 560 Waxed Block of Copper 508 Polished Tuff 403 Chiseled Tuff Bricks 395 Powder Snow 44 Waxed Oxidized Copper 36 Waxed Copper Bulb 8 Oxidized Cut Copper 4 Waxed Oxidized Cut Copper		JE: 150⁄1231 (12.19%) BE: ?
Column
trial_chambers/chamber/addon/c1_breeze	The column substructure is exclusive to chamber_1 as chamber_2's column is built-in. It generated in the middle of the chamber, always features a breeze trial chamber on its middle level. It generated with a staircase connecting the lower level of the room to the middle level of the column. On the upper level, the columns attempts to generate hanging platforms on all four sides. However, a hanging platform may fail to generate if the space is already occupied by an entrance piece.	96 Tuff Bricks 66 Waxed Block of Copper 41 Polished Tuff 34 Chiseled Tuff Bricks 7 Waxed Copper Bulb		1⁄1 (100%)
trial_chambers/chamber/addon/lower_staircase_down		3 Tuff Bricks 3 Waxed Block of Copper 2 Waxed Oxidized Copper 2 Chiseled Tuff Bricks 1 Waxed Oxidized Cut Copper Stairs		1⁄1 (100%)
Entrances
trial_chambers/chamber/addon/full_stacked_walkway	This sub-structure can generate attached to any entrance, except the one to the left of the ominous vault. It acts as a walkway that features a ranged trial spawner.	359 Tuff Bricks 114 Polished Tuff 86 Waxed Block of Copper 59 Waxed Oxidized Copper 38 Chiseled Tuff Bricks 17 Waxed Oxidized Cut Copper 11 Oxidized Cut Copper 9 Waxed Oxidized Cut Copper Stairs 1 Waxed Oxidized Copper Grate 1 Waxed Copper Bulb		1⁄6 (16.67%)
trial_chambers/chamber/addon/full_stacked_walkway_2	This sub-structure can generate attached to any entrance, except the one to the left of the ominous vault. It acts as a walkway that features a ranged trial spawner and a vault. Dispensers (dispensers/chamber) can generate in the walls.	326 Tuff Bricks 100 Polished Tuff 62 Waxed Block of Copper 48 Waxed Oxidized Copper 25 Chiseled Tuff Bricks 10 Oxidized Cut Copper 9 Waxed Oxidized Cut Copper Stairs 5 Waxed Oxidized Cut Copper 2 Waxed Copper Bulb		1⁄6 (16.67%)
trial_chambers/chamber/addon/full_corner_column	This sub-structure can generate attached to any entrance, except the one to the right of the ominous vault and the middle level one. It generates hanging platforms directly in front of the entrance and to the left when entering the chamber.	777 Tuff Bricks 68 Waxed Block of Copper 51 Chiseled Tuff Bricks 25 Waxed Oxidized Copper 25 Polished Tuff 5 Waxed Copper Bulb		1⁄6 (16.67%)
trial_chambers/chamber/addon/grate_bridge	This sub-structure can generate attached to any upper level entrance. It connects the entrance to the column.	58 Polished Tuff 20 Waxed Copper Grate 10 Waxed Block of Copper		1⁄6 (16.67%)
trial_chambers/chamber/addon/short_platform	This sub-structure can generate attached to any upper level entrance. It acts as a small overhang.	20 Waxed Copper Grate 3 Waxed Block of Copper		1⁄6 (16.67%)
trial_chambers/chamber/addon/short_grate_platform	This sub-structure acts similarly to short_platform, except it tries to generate hanging platforms on all three sides; a hanging platform may fail to generate if the space is already occupied by an entrance piece.	10 Waxed Copper Grate 3 Polished Tuff 3 Waxed Block of Copper		1⁄6 (16.67%)
Hanging platform
trial_chambers/chamber/addon/hanging_platform	This sub-structure is a hanging platform that tries to generate when called by the full_corner_column or short_grate_platform sub-structures.	16 Polished Tuff 8 Waxed Copper Grate 8 Waxed Block of Copper 5 Iron Chain 2 Waxed Chiseled Copper		1⁄1 (100%)
Unused
trial_chambers/chamber/addon/walkway_with_bridge_1	This pieces is an unused sub-structure. Despite existing within the template pool with a weight of 1⁄10, it cannot generate as it doesn't include any jigsaw block. It includes a structure block in save mode.	487 Tuff Bricks 169 Polished Tuff 135 Waxed Oxidized Copper 78 Waxed Block of Copper 48 Chiseled Tuff Bricks 9 Waxed Oxidized Cut Copper 9 Waxed Copper Bulb 1 Structure Block		—

Pedestal

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/pedestal	Pedestal is a large room with a large pedestal in its center. It has two potential entrances; one on its upper level and one on its lower level. It generates with 8 slices via jigsaw blocks, including an ominous one, and 4 quadrants.	5906 Tuff Bricks 1124 Polished Tuff 1067 Waxed Oxidized Copper 573 Waxed Block of Copper 368 Chiseled Tuff Bricks 77 Waxed Oxidized Cut Copper 45 Waxed Copper Bulb		JE: 150⁄1231 (12.19%) BE: ?
Center
trial_chambers/chamber/pedestal/center_1	This center piece is a large pedestal with three trial spawners on top. One of these trial spawners is a breeze trial spawner, and the two other can generate either melee, small melee or ranged mobs.	124 Polished Tuff 97 Waxed Oxidized Copper 57 Tuff Bricks 40 Waxed Block of Copper		1⁄1 (100%)
Slices
trial_chambers/chamber/pedestal/ominous_slice_1	This slice always generates opposite the upper potential entrance. It contains an ominous vault on its upper floor. This slice always generate as part of one slice when Pedestal tries to generate.‌[Java Edition only]	36 Polished Tuff 33 Waxed Oxidized Copper 30 Waxed Block of Copper 14 Waxed Copper Grate 9 Tuff Bricks		1⁄1 (100%)
trial_chambers/chamber/pedestal/slice_1	This slice can be attached to any wall. It contains a vault on its upper floor.	60 Polished Tuff 57 Waxed Oxidized Copper 9 Waxed Copper Grate 6 Tuff Bricks 6 Waxed Block of Copper 3 Waxed Oxidized Cut Copper		1⁄13 (7.69%)
trial_chambers/chamber/pedestal/slice_2	This slice can be attached to any wall. It contains a vault on its lower floor.	60 Polished Tuff 42 Waxed Oxidized Copper 40 Waxed Copper Grate 39 Waxed Block of Copper 12 Tuff Bricks 3 Waxed Oxidized Cut Copper		3⁄13 (23.08%)
trial_chambers/chamber/pedestal/slice_3	This slice can be attached to any wall. It contains a vault on its upper floor.	63 Waxed Copper Grate 48 Polished Tuff 45 Waxed Oxidized Copper 42 Waxed Block of Copper 24 Tuff Bricks 3 Waxed Oxidized Cut Copper		3⁄13 (23.08%)
trial_chambers/chamber/pedestal/slice_4	This slice can be attached to any wall. It contains a vault on its lower floor.	72 Waxed Copper Grate 54 Waxed Oxidized Copper 54 Waxed Block of Copper 51 Polished Tuff 30 Tuff Bricks 3 Waxed Oxidized Cut Copper		3⁄13 (23.08%)
trial_chambers/chamber/pedestal/slice_5	This slice can be attached to any wall. It contains a vault on its upper floor.	54 Polished Tuff 48 Waxed Oxidized Copper 42 Waxed Block of Copper 40 Waxed Copper Grate 12 Tuff Bricks		3⁄13 (23.08%)
Quadrants
trial_chambers/chamber/pedestal/quadrant_1	These sub-structures theoretically generate in the corners of the chamber. However, due to a bug, the Pedestal chamber can only generate with the Slanted chamber's quadrants (see § Slanted).[8]	130 Polished Tuff 105 Waxed Oxidized Copper 50 Tuff Bricks 23 Waxed Block of Copper 15 Waxed Oxidized Cut Copper Stairs 6 Waxed Oxidized Cut Copper 3 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/chamber/pedestal/quadrant_2		247 Tuff Bricks 90 Waxed Oxidized Copper 84 Polished Tuff 6 Waxed Block of Copper 3 Waxed Oxidized Cut Copper 2 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/chamber/pedestal/quadrant_3		120 Tuff Bricks 118 Polished Tuff 114 Waxed Oxidized Copper 52 Waxed Block of Copper 5 Waxed Cut Copper Stairs 3 Waxed Oxidized Cut Copper 1 Waxed Copper Bulb		1⁄3 (33.33%)

Chamber_4

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/chamber_4	Chamber_4 is a small two-story room. It has three potential entrance; one on the lower level and two on the upper level. It generates two small melee trial spawners, both on the upper level, and a vault on each level. An ominous vault is located between the two upper level potential entrances. Chamber 4 also generates copper grate walls near the lower entrance. with a 1-block layer gap. Chamber 4 does not come with addons nor generate dispensers in the walls. However, it may generate various decor (see § Decor).	3382 Tuff Bricks 546 Polished Tuff 446 Waxed Oxidized Copper 308 Waxed Block of Copper 258 Chiseled Tuff Bricks 60 Waxed Oxidized Cut Copper 30 Waxed Copper Grate 30 Waxed Copper Bulb 15 Waxed Oxidized Cut Copper Stairs 13 Chiseled Tuff		JE: 150⁄1231 (12.19%) BE: ?

Eruption

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/eruption	Eruption is a large room with a fountain-like structure in its center surrounded by magma blocks. It has three potential entrances; one on its upper level and two on its lower level. It generates a breeze trial spawner and a vault on the side where it does not have a potential entrance. The three other sides are filled with random slices, and the corners are filled with random quadrants.	3518 Tuff Bricks 459 Polished Tuff 290 Waxed Block of Copper 235 Waxed Oxidized Copper 190 Chiseled Tuff Bricks 71 Waxed Oxidized Cut Copper 32 Magma Block 15 Waxed Copper Bulb 4 Waxed Oxidized Cut Copper Stairs 4 Waxed Copper Grate 2 Waxed Chiseled Copper		JE: 150⁄1231 (12.19%) BE: ?
Center
trial_chambers/chamber/eruption/center_1	Center 1 is a center pedestal which contains a fountain-like structure with a dispenser. It theoretically contains a hidden vault inside; however, due to limited space, the vault never generates.	44 Polished Tuff 33 Tuff Bricks 20 Waxed Oxidized Copper 14 Waxed Block of Copper 13 Magma Block 4 Oak Button 4 Waxed Oxidized Cut Copper 2 Waxed Copper Bulb 1 Dispenser (1 Water Bucket)		1⁄1 (100%)
Slices
trial_chambers/chamber/eruption/breeze_slice_1	Breeze slice 1 is the slice placed on the only side without any potential entrances. It contains a breeze trial spawner and an ominous vault.	91 Tuff Bricks 54 Waxed Block of Copper 48 Polished Tuff 20 Waxed Oxidized Cut Copper 11 Chiseled Tuff Bricks 8 Waxed Oxidized Copper 5 Magma Block 5 Waxed Oxidized Cut Copper Stairs 2 Waxed Chiseled Copper 1 Chiseled Tuff 1 Waxed Copper Bulb		1⁄1 (100%)
trial_chambers/chamber/eruption/slice_1	Slice 1 can be attached to any potential entrance. It contains a vault on its upper floor.	99 Tuff Bricks 92 Polished Tuff 58 Waxed Block of Copper 55 Waxed Oxidized Copper 23 Chiseled Tuff Bricks 17 Waxed Oxidized Cut Copper 5 Magma Block 1 Chiseled Tuff 1 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/chamber/eruption/slice_2	Slice 2 can be attached to any potential entrance.	84 Polished Tuff 53 Tuff Bricks 48 Waxed Oxidized Copper 44 Waxed Block of Copper 20 Waxed Oxidized Cut Copper 10 Chiseled Tuff Bricks 6 Waxed Oxidized Cut Copper Stairs 5 Magma Block 1 Chiseled Tuff		1⁄3 (33.33%)
trial_chambers/chamber/eruption/slice_3	Slice 3 can be attached to any potential entrance. It contains a melee trial spawner on its lower floor.	83 Polished Tuff 72 Tuff Bricks 53 Waxed Block of Copper 46 Waxed Oxidized Copper 13 Waxed Oxidized Cut Copper 10 Chiseled Tuff Bricks 5 Magma Block 1 Chiseled Tuff 1 Waxed Chiseled Copper		1⁄3 (33.33%)
Quadrants
trial_chambers/chamber/eruption/quadrant_1	Quadrant 1 can generate in the corners of the chamber.	286 Tuff Bricks 81 Polished Tuff 70 Waxed Block of Copper 53 Waxed Oxidized Copper 46 Chiseled Tuff Bricks 20 Waxed Oxidized Cut Copper 8 Magma Block 7 Waxed Copper Bulb 1 Waxed Copper Grate 1 Waxed Chiseled Copper		1⁄5 (20%)
trial_chambers/chamber/eruption/quadrant_2	Quadrant 2 can generate in the corners of the chamber. It contains a vault on its upper floor.	288 Tuff Bricks 127 Polished Tuff 92 Waxed Oxidized Copper 83 Waxed Block of Copper 43 Chiseled Tuff Bricks 17 Waxed Oxidized Cut Copper 8 Magma Block 6 Waxed Copper Bulb 1 Waxed Copper Grate		1⁄5 (20%)
trial_chambers/chamber/eruption/quadrant_3	Quadrant 3 can generate in the corners of the chamber. It contains a vault on its upper floor.	331 Tuff Bricks 143 Polished Tuff 99 Waxed Oxidized Copper 81 Waxed Block of Copper 46 Chiseled Tuff Bricks 15 Waxed Oxidized Cut Copper 8 Magma Block 6 Waxed Oxidized Cut Copper Stairs 5 Waxed Copper Bulb 2 Waxed Cut Copper Stairs 1 Waxed Copper Grate		1⁄5 (20%)
trial_chambers/chamber/eruption/quadrant_4	Quadrant 4 can generate in the corners of the chamber. It contains a ranged trial spawner on its upper floor.	296 Tuff Bricks 93 Polished Tuff 86 Waxed Block of Copper 62 Waxed Oxidized Copper 54 Chiseled Tuff Bricks 20 Waxed Oxidized Cut Copper 8 Magma Block 6 Waxed Copper Bulb 4 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Grate 1 Waxed Chiseled Copper		1⁄5 (20%)
trial_chambers/chamber/eruption/quadrant_5	Quadrant 5 can generate in the corners of the chamber. It contains a ranged trial spawner on its upper floor.	287 Tuff Bricks 114 Polished Tuff 80 Waxed Oxidized Copper 68 Waxed Block of Copper 48 Chiseled Tuff Bricks 20 Waxed Oxidized Cut Copper 8 Magma Block 2 Waxed Copper Bulb 1 Waxed Copper Grate 1 Waxed Chiseled Copper		1⁄5 (20%)

Assembly

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/assembly	Assembly is a large room consisting of a main floor, a balcony and a platform. It has three potential entrances: one leading to the platform, one to the balcony, and one in a underground passageway. The main floor contains a vault, a breeze trial spawner, an ominous vault embedded in a wall, and may have dispensers embedded in the walls. The platform contains two vaults and a ranged trial spawner. The underground passageway, located below the main floor, contains a single vault. On the main floor, 11 random upper addons, such as hanging platforms, generate attached to the ceiling, while 11 random lower addons generate attached to the floor. In addition to these addons, dispensers may generate embedded in the walls. The two staircases leading to the balcony are randomly selected.	10579 Tuff Bricks 755 Polished Tuff 598 Waxed Oxidized Copper 545 Waxed Block of Copper 344 Chiseled Tuff Bricks 81 Waxed Oxidized Cut Copper 51 Waxed Copper Bulb 27 Waxed Oxidized Cut Copper Stairs 22 Waxed Copper Grate 13 Waxed Oxidized Copper Trapdoor 5 Waxed Chiseled Copper		JE: 150⁄1231 (12.19%) BE: ?
Addons (lower)
trial_chambers/chamber/assembly/cover_1	These addons consist in walls of copper grates around staircases embedded into the floor and sealed by trapdoors.	61 Tuff Bricks 21 Waxed Copper Grate 12 Waxed Oxidized Copper 8 Waxed Oxidized Cut Copper 7 Waxed Block of Copper 3 Waxed Oxidized Copper Trapdoor 2 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_2		57 Tuff Bricks 21 Waxed Copper Grate 12 Waxed Oxidized Copper 10 Waxed Oxidized Cut Copper 7 Waxed Block of Copper 4 Waxed Oxidized Copper Trapdoor 2 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_3		65 Tuff Bricks 18 Waxed Copper Grate 10 Waxed Oxidized Copper 9 Waxed Block of Copper 6 Waxed Oxidized Cut Copper 2 Waxed Oxidized Cut Copper Stairs 2 Waxed Oxidized Copper Trapdoor 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_4		61 Tuff Bricks 13 Waxed Copper Grate 12 Waxed Oxidized Copper 8 Waxed Oxidized Cut Copper 7 Waxed Block of Copper 3 Waxed Oxidized Copper Trapdoor 2 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_5		57 Tuff Bricks 12 Waxed Oxidized Copper 10 Waxed Copper Grate 10 Waxed Oxidized Cut Copper 7 Waxed Block of Copper 4 Waxed Oxidized Copper Trapdoor 2 Waxed Oxidized Cut Copper Stairs 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_6		65 Tuff Bricks 11 Waxed Copper Grate 10 Waxed Oxidized Copper 9 Waxed Block of Copper 6 Waxed Oxidized Cut Copper 2 Waxed Oxidized Cut Copper Stairs 2 Waxed Oxidized Copper Trapdoor 1 Waxed Copper Bulb		2⁄22 (9.09%)
trial_chambers/chamber/assembly/cover_7	This addon is identical to the previous ones, but without walls of copper grates around the staircases.	65 Tuff Bricks 23 Waxed Oxidized Copper 6 Waxed Oxidized Cut Copper 2 Waxed Oxidized Cut Copper Stairs 2 Waxed Oxidized Copper Trapdoor 1 Waxed Copper Bulb		5⁄22 (22.73%)
trial_chambers/chamber/assembly/full_column	This addon consists in a large pillar attached to the ceiling.	29 Tuff Bricks 16 Waxed Block of Copper 10 Waxed Oxidized Copper 9 Polished Tuff 8 Chiseled Tuff Bricks		2⁄22 (9.09%)
trial_chambers/chamber/assembly/platform_1	This addon is a small platform.	12 Waxed Oxidized Cut Copper 8 Tuff Bricks 8 Waxed Block of Copper 2 Waxed Oxidized Copper		2⁄22 (9.09%)
trial_chambers/chamber/assembly/spawner_1	This addon is a taller platform outlined with staircases leading to a lower part. Despite its name, it does not generate with a trial spawner.	30 Tuff Bricks 18 Waxed Oxidized Copper 10 Waxed Block of Copper 6 Waxed Oxidized Cut Copper Stairs 2 Waxed Copper Bulb		1⁄22 (4.55%)
Addons (upper)
trial_chambers/chamber/assembly/hanging_1	These hanging platforms may generate attached to the ceiling, provided a full_column lower addon prevent the generation by taking the room.	12 Iron Chain 11 Polished Tuff 9 Waxed Copper Grate 6 Waxed Block of Copper 4 Waxed Chiseled Copper		2⁄11 (18.18%)
trial_chambers/chamber/assembly/hanging_2		21 Waxed Copper Grate 21 Polished Tuff 20 Iron Chain 4 Waxed Chiseled Copper 4 Waxed Block of Copper		1⁄11 (9.09%)
trial_chambers/chamber/assembly/hanging_3		8 Iron Chain 7 Polished Tuff 3 Waxed Copper Grate 2 Waxed Chiseled Copper 2 Waxed Block of Copper		2⁄11 (18.18%)
trial_chambers/chamber/assembly/hanging_4		13 Polished Tuff 8 Iron Chain 3 Waxed Copper Grate 2 Waxed Chiseled Copper 2 Waxed Block of Copper		2⁄11 (18.18%)
trial_chambers/chamber/assembly/hanging_5	This sub-structure consists in no hanging platform, leaving the ceiling empty.	9 Polished Tuff		4⁄11 (36.36%)
Staircases
trial_chambers/chamber/assembly/right_staircase_1	One of the three staircases designs leading to the balcony. The right and left sides are independent.	239 Tuff Bricks 51 Waxed Block of Copper 40 Polished Tuff 27 Chiseled Tuff Bricks 22 Waxed Oxidized Copper 12 Waxed Oxidized Cut Copper Stairs 12 Waxed Oxidized Cut Copper 9 Waxed Copper Grate 7 Waxed Copper Bulb 1 Waxed Chiseled Copper		1⁄3 (33.33%)
trial_chambers/chamber/assembly/left_staircase_1		172 Tuff Bricks 51 Waxed Block of Copper 49 Polished Tuff 40 Waxed Oxidized Copper 27 Chiseled Tuff Bricks 9 Waxed Copper Grate 9 Waxed Oxidized Cut Copper 8 Waxed Copper Bulb 1 Waxed Chiseled Copper
trial_chambers/chamber/assembly/right_staircase_2	One of the three staircases designs leading to the balcony. The right and left sides are independent.	254 Tuff Bricks 57 Polished Tuff 56 Waxed Oxidized Copper 54 Waxed Block of Copper 33 Chiseled Tuff Bricks 9 Waxed Copper Grate 8 Waxed Copper Bulb 4 Ladder 2 Waxed Chiseled Copper		1⁄3 (33.33%)
trial_chambers/chamber/assembly/left_staircase_2		254 Tuff Bricks 57 Polished Tuff 56 Waxed Oxidized Copper 54 Waxed Block of Copper 33 Chiseled Tuff Bricks 9 Waxed Copper Grate 8 Waxed Copper Bulb 4 Ladder 2 Waxed Chiseled Copper
trial_chambers/chamber/assembly/right_staircase_3	One of the three staircases designs leading to the balcony. The right and left sides are independent. It contains a trial spawner that can generate either melee, small melee or ranged mobs on the upper floor.	172 Tuff Bricks 51 Waxed Block of Copper 49 Polished Tuff 40 Waxed Oxidized Copper 27 Chiseled Tuff Bricks 9 Waxed Copper Grate 9 Waxed Oxidized Cut Copper 8 Waxed Copper Bulb 1 Waxed Chiseled Copper		1⁄3 (33.33%)
trial_chambers/chamber/assembly/left_staircase_3		245 Tuff Bricks 51 Waxed Block of Copper 40 Polished Tuff 27 Chiseled Tuff Bricks 22 Waxed Oxidized Copper 12 Waxed Oxidized Cut Copper Stairs 9 Waxed Copper Grate 7 Waxed Copper Bulb 6 Waxed Oxidized Cut Copper 1 Waxed Chiseled Copper

Chamber_8

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/chamber_8	Chamber_8 is a tall four-story room. It has two potential entrance; one on the lower level and one on the third level. The first floor contains two vaults. The second and third floors both contain a slow ranged trial spawner. The fourth floor contains two slow ranged trial spawners, a vault, and an ominous vault. Dispensers can generate in the walls. It does not generate with addons.	2736 Tuff Bricks 528 Waxed Block of Copper 321 Polished Tuff 172 Waxed Oxidized Cut Copper 170 Chiseled Tuff Bricks 124 Waxed Oxidized Copper 40 Waxed Copper Grate 31 Oxidized Copper Trapdoor 23 Waxed Copper Bulb 17 Chiseled Tuff 9 Waxed Cut Copper Slab		JE: 150⁄1231 (12.19%) BE: ?

Slanted

Name	Description	Blocks	Image[note 5]	Weight
trial_chambers/chamber/slanted	Slanted is a large two-story room. It has two potential entrance; one on the lower level and one on the upper level. It has a breeze trial spawner in its center around which are 4 slices, including an ominous one, and 4 quadrants. Unlike other chambers that generate with full slices, Slanted's slice are split into two parts: hallways (on the lower level) and ramps (on the upper level).	4798 Tuff Bricks 505 Polished Tuff 406 Waxed Block of Copper 204 Chiseled Tuff Bricks 38 Waxed Copper Bulb 12 Waxed Oxidized Copper		JE: 150⁄1231 (12.19%) BE: ?
Center
trial_chambers/chamber/slanted/center	This pieces generates in the center. It contains a breeze trial spawner on the upper floor.	42 Polished Tuff 39 Waxed Oxidized Copper 11 Tuff Bricks 3 Waxed Block of Copper 2 Chiseled Tuff Bricks 1 Chiseled Tuff 1 Waxed Copper Bulb		1⁄1 (100%)
Slices (hallways)
trial_chambers/chamber/slanted/hallway_1	These pieces consist of the lower part of Slanted's slices. hallway_2 contains a vault.	42 Waxed Oxidized Copper 40 Polished Tuff		1⁄3 (33.33%)
trial_chambers/chamber/slanted/hallway_2		36 Waxed Oxidized Copper 34 Polished Tuff 11 Tuff Bricks 9 Waxed Copper Grate 9 Waxed Block of Copper 1 Waxed Copper Bulb		1⁄3 (33.33%)
trial_chambers/chamber/slanted/hallway_3		42 Waxed Oxidized Copper 34 Polished Tuff 18 Waxed Copper Grate 9 Waxed Block of Copper		1⁄3 (33.33%)
Slices (ramps)
trial_chambers/chamber/slanted/ominous_upper_arm_1	This piece consist of an upper part of Slanted's slices. It generates attached to a single side of the center piece and contains an ominous vault. This piece is the only slice to always generate inside the Slanted chamber, taking up one slice although this addon generates throughout different slices per generation of Slanted, leaving three ramps to be filled with other types of ramps.	42 Polished Tuff 40 Waxed Oxidized Copper 22 Tuff Bricks 15 Waxed Oxidized Copper Grate 8 Chiseled Tuff Bricks 8 Waxed Block of Copper 2 Waxed Copper Bulb		1⁄1 (100%)
trial_chambers/chamber/slanted/ramp_1	These pieces consist of the lower part of Slanted's slices. ramp_1 and ramp_2 contain a melee trial spawner. ramp_3 contains a ranged trial spawner.	42 Polished Tuff 41 Waxed Oxidized Copper 40 Tuff Bricks 8 Waxed Oxidized Cut Copper Slab 7 Waxed Copper Grate		1⁄4 (25%)
trial_chambers/chamber/slanted/ramp_2		73 Tuff Bricks 42 Polished Tuff 32 Waxed Oxidized Copper 8 Waxed Block of Copper 7 Waxed Copper Grate		1⁄4 (25%)
trial_chambers/chamber/slanted/ramp_3		52 Tuff Bricks 42 Polished Tuff 18 Waxed Oxidized Copper 10 Waxed Oxidized Cut Copper Stairs 9 Waxed Block of Copper 7 Waxed Copper Grate 3 Waxed Oxidized Cut Copper Slab		1⁄4 (25%)
trial_chambers/chamber/slanted/ramp_4		43 Waxed Oxidized Copper 42 Polished Tuff 6 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)
Quadrants
trial_chambers/chamber/slanted/quadrant_1	This quadrant consists of a staircase connecting the two floors. It contains a vault under the staircase and a melee trial spawner on the upper level.	138 Polished Tuff 130 Waxed Oxidized Copper 49 Tuff Bricks 23 Waxed Block of Copper 15 Waxed Oxidized Cut Copper Stairs 5 Waxed Copper Grate 5 Waxed Copper Bulb		1⁄4 (25%)
trial_chambers/chamber/slanted/quadrant_2	These quadrants consist in two unconnected floors, each containing a vault.	135 Polished Tuff 121 Tuff Bricks 104 Waxed Oxidized Copper 49 Waxed Block of Copper 6 Waxed Copper Bulb 3 Waxed Oxidized Cut Copper Stairs 3 Waxed Cut Copper Stairs		1⁄4 (25%)
trial_chambers/chamber/slanted/quadrant_3		137 Polished Tuff 120 Waxed Oxidized Copper 99 Tuff Bricks 35 Waxed Block of Copper 7 Waxed Copper Bulb 6 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)
trial_chambers/chamber/slanted/quadrant_4	This quadrants consists of parkour platforms connecting the two floors. It contains dispensers embedded in its walls.	108 Polished Tuff 96 Waxed Oxidized Copper 80 Tuff Bricks 27 Waxed Block of Copper 14 Waxed Oxidized Copper Grate 6 Waxed Copper Bulb 1 Waxed Oxidized Cut Copper Stairs		1⁄4 (25%)

Decor includes decorated pots, flower pots, candles, and barrels. It can generate in slices, some encounters, and undecorated_pot can generate in chamber_4.

Disposals and beds are also classified as decor but are not part of the decor pool: they only generate near chamber entrances and at intersections respectively.

Name	Description	Blocks	Image	Weight
Decor (regular)
trial_chambers/decor/barrel	Barrels controlled by a loot table.	1 Barrel 1 Waxed Oxidized Cut Copper		2⁄45 (4.44%)
trial_chambers/decor/flow_pot	Decorated pots controlled by a loot table. They respectively have a flow pottery sherd, a guster pottery sherd, a scrape pottery sherd or empty. A decorated pot with a flow pottery sherd also generates inside the secret room of intersection_2, but it is not controlled by a decorated pot loot table and always contains three strings unlike the decorated pots in the decor category.	1 Decorated Pot (Flow) 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/guster_pot		1 Decorated Pot (Guster) 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/scrape_pot		1 Decorated Pot (Scrape) 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/undecorated_pot		1 Decorated Pot 1 Waxed Oxidized Cut Copper		10⁄45 (22.22%)
trial_chambers/decor/candle_1	Candles are never lit.	1 Candle 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/candle_2		2 Candle 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/candle_3		3 Candle 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/candle_4		4 Candle 1 Waxed Oxidized Cut Copper		1⁄45 (2.22%)
trial_chambers/decor/dead_bush_pot	—	1 Potted Dead Bush 1 Waxed Oxidized Cut Copper		2⁄45 (4.44%)
trial_chambers/decor/empty_pot	—	1 Flower Pot 1 Waxed Oxidized Cut Copper		2⁄45 (4.44%)
Disposal
trial_chambers/decor/disposal	Disposals consist of a hopper placed above an empty barrel. Their purpose is to help players manage their inventory before entering a chamber.[7]	3 Tuff Bricks 1 Barrel 1 Hopper 1 Waxed Chiseled Copper 1 Waxed Copper Bulb 1 Waxed Oxidized Cut Copper Stairs		1⁄1 (100%)
Bed
trial_chambers/decor/<color>_bed	Beds can generate in any color, with each color having a 6.52% (3⁄46) chance of generating, except pink which has a 2.17% (1⁄46) chance. The bed that generate in the secret rooms of entrance_1 and intersection_2 is not generated via this substructure and therefore is always purple.	1 Bed		1⁄1 (100%)

Dispensers in this category are controlled by loot table dispensers/trial_chambers/chamber. (See § Chamber dispenser for loot table.)

Name	Description	Blocks	Image	Weight
trial_chambers/dispensers/chamber	Generates in full_stacked_walkway_2 (an addon of chamber_1 and chamber_2.)	2 Chiseled Tuff Bricks 2 Stone Button 1 Dispenser		1⁄4 (25%)
trial_chambers/dispensers/floor_dispenser	It generates in slice_5 and slice_6. (an addon of assembly.)	1 Oak Pressure Plate 1 Dispenser		1⁄4 (25%)
trial_chambers/dispensers/wall_dispenser	It generates in all chamber rooms except for eruption[note 11] and chamber_4.	1 Waxed Copper Bulb 1 Dispenser 1 Oak Button 1 Waxed Block of Copper		1⁄4 (25%)

Other loot containers that belong to categories trial_chambers/chests and trial_chambers/reward.

Name	Description	Blocks	Image
Chests
trial_chambers/chests/connectors/supply	This substructure is a technical connector. It is always replaced by air during the structure generation.	2 Jigsaw Block
trial_chambers/chests/supply	Only appears in cache_1.	1 Chest 5 Chiseled Tuff Bricks 4 Polished Andesite
Vaults
trial_chambers/reward/vault	—	1 Vault 5 Waxed Cut Copper Slab 3 Waxed Cut Copper 6 Tuff Bricks
trial_chambers/reward/ominous_vault	—	7 Polished Tuff 2 Waxed Copper Bulb 5 Tuff Bricks 2 Polished Tuff Slab 2 Red Glazed Terracotta 1 Chiseled Tuff 7 Red Candle (left 4, right 3) 1 Ominous Vault 6 Waxed Oxidized Copper Grate

Name	Description	Blocks	Image
Technical
trial_chambers/spawners/connectors/breeze trial_chambers/spawners/connectors/melee trial_chambers/spawners/connectors/ranged trial_chambers/spawners/connectors/slow_ranged trial_chambers/spawners/connectors/small_melee	These substructures are technical connectors with jigsaw blocks. They are replaced by air during the structure generation.	2 Jigsaw Block
Trial spawners
trial_chambers/spawner/breeze/breeze	Spawns breezes.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Chiseled Tuff
trial_chambers/spawner/melee/husk	Spawns husks.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Chiseled Sandstone
trial_chambers/spawner/melee/spider	Spawns spiders.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Stone 5 Cobweb
trial_chambers/spawner/melee/zombie	Spawns zombies.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Mossy Cobblestone
trial_chambers/spawner/ranged/poison_skeleton	Spawns bogged.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 2 Bone Block 2 Podzol 2 Red Mushroom
trial_chambers/spawner/slow_ranged/poison_skeleton	Spawns bogged. Unlike the regular spawner: 4 mobs are allowed to exist simultaneously instead of 3, an additional player adds 2 mobs instead of 0.5, and the spawner waits 160 game ticks (8 seconds) ticks between spawn attempts instead of 20 game ticks (1 second).
trial_chambers/spawner/ranged/skeleton	Spawns skeletons.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Bone Block
trial_chambers/spawner/slow_ranged/skeleton	Spawns skeletons. Unlike the regular spawner: 4 mobs are allowed to exist simultaneously instead of 3, an additional player adds 2 mobs instead of 0.5, and the spawner waits 160 game ticks (8 seconds) ticks between spawn attempts instead of 20 game ticks (1 second).
trial_chambers/spawner/ranged/stray	Spawns strays.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Packed Ice
trial_chambers/spawner/slow_ranged/stray	Spawns strays. Unlike the regular spawner: 4 mobs are allowed to exist simultaneously instead of 3, an additional player adds 2 mobs instead of 0.5, and the spawner waits 160 game ticks (8 seconds) ticks between spawn attempts instead of 20 game ticks (1 second).
trial_chambers/spawner/small_melee/baby_zombie	Spawns baby zombies.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 2 Cobblestone 2 Mossy Cobblestone
trial_chambers/spawner/small_melee/cave_spider	Spawns cave spiders.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 2 Stone 2 Podzol 2 Red Mushroom 3 Cobweb
trial_chambers/spawner/small_melee/silverfish	Spawns silverfishes.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Stone Bricks
trial_chambers/spawner/small_melee/slime	Spawns slimes.	1 Trial Spawner 4 Waxed Chiseled Copper 1 Waxed Block of Copper 4 Moss Block

Natural hostile mob spawning is disabled within a trial chamber. Mobs spawn only from the trial spawners. The number of mobs spawned scales with the number of players in range of each spawner, and breezes are spawned less per spawner and per player than other mobs.

When a trial chamber structure generates, one mob from each of the following categories is randomly selected for the trial spawners in that structure. Every mob within the same category has an equal chance to be selected. The breeze is in its own category and is thus guaranteed to be found in certain chambers.

Trial spawner configuration

Category	Mob spawned	Floor	Blocks in/on the floor
Breeze	Breeze		1 block of copper 4 chiseled copper 4 chiseled tuff
Melee	Zombie		1 block of copper 4 chiseled copper 4 mossy cobblestone
	Husk		1 block of copper 4 chiseled copper 4 chiseled sandstone
	Spider		1 block of copper 4 chiseled copper, one of which with 1 cobweb on top 4 stone with 4 cobwebs on top
Small melee	Slime		1 block of copper 4 chiseled copper 4 moss blocks
	Silverfish		1 block of copper 4 chiseled copper 4 stone bricks
	Baby Zombie		1 block of copper 4 chiseled copper 2 cobblestone 2 mossy cobblestone
	Cave spider		1 block of copper 4 chiseled copper, one of which with 1 cobweb on top 2 podzol with 2 red mushrooms on top 2 stone with 2 cobwebs on top
Ranged	Stray		1 block of copper 4 chiseled copper 4 packed ice
	Skeleton		1 block of copper 4 chiseled copper 4 bone blocks
	Bogged		1 block of copper 4 chiseled copper 2 podzol with 2 red mushrooms on top 2 bone blocks

Additionally, chickens can also appear in trial chambers in two different ways.

• In Java Edition, baby zombies or baby husks that spawn have a 5% chance to spawn as a chicken jockey.
• Naturally generated dispensers can contain eggs and breezes can unintentionally power a button or pressure plate, activating the dispenser to fire the eggs, which have an 1/8 chance to spawn a chick.

Loot is available from vaults, chests, barrels, dispensers, and decorated pots from within the chambers. Players who defeat a trial spawner each receive rewards; this loot scales depending on the number of players who defeat the trial spawner.

Vaults and chests (known as reward chests in game) in entrance_1's secret room and the hallway dead end rubble share the same loot table.

In Java Edition, each trial chambers vault and reward chest contains items drawn from 3 pools, with the following distribution:

In Bedrock Edition, each trial chambers vault and reward chest contains items drawn from 3 pools, with the following distribution:

In Java Edition and Bedrock Edition, each trial chambers ominous vault contains items drawn from 3 pools, with the following distribution:

In Java Edition and Bedrock Edition, each trial chambers entrance chest contains 2–3 item stacks, with the following distribution:

The room where the loot is stored is actually inside in the room end_2, not an intersection. In Java Edition and Bedrock Edition, each trial chambers intersection chest contains 1–3 item stacks, with the following distribution:

Supply loot only occurs in chests within cache_1. In Java Edition and Bedrock Edition, each trial chambers supply chest contains 3–5 item stacks, with the following distribution:

In Java Edition, each trial chambers intersection barrel contains 1–3 item stacks, with the following distribution:

In Bedrock Edition, each trial chambers intersection barrel contains 1–3 item stacks, with the following distribution:

Corridor barrels are named as "corridor chests" in the game files, but the loot is stored inside barrels. In Java Edition and Bedrock Edition, each trial chambers corridor chest contains 1–3 item stacks, with the following distribution:

In addition to the below, decorated pots may have flow, guster, or scrape designs, which yield their respective pottery sherds when broken, along with bricks for any blank sides. There is a ¹⁰⁄₁₃ chance that the pot is composed entirely out of bricks, and ¹⁄₁₃ chance for each of the variants with a single sherd.

In Java Edition and Bedrock Edition, each trial chambers corridor pot contains 1 item stack, with the following distribution:

See § Dispenser for substructures with loot table.

In Java Edition and Bedrock Edition, each trial chambers chamber dispenser contains 1 item stack, with the following distribution:

In Java Edition and Bedrock Edition, each trial chambers corridor dispenser contains 1 item stack, with the following distribution:

In Java Edition and Bedrock Edition, each trial chambers water dispenser contains 1 item stack, with the following distribution:

When all mobs have been killed, the trial spawner has a 50% chance of picking the trial key, in which case it drops for all players. The other 50% of the time it drops one of the other items for each player.

In Java Edition and Bedrock Edition, each trial chambers trial spawner contains 1 item stack, with the following distribution:

When all mobs have been killed, the ominous trial spawner has a 30% chance of picking the ominous trial key, in which case it drops for all players. The other 70% of the time it drops one of the other items for each player.

In Java Edition and Bedrock Edition, each trial chamber ominous trial spawner contains 1 item stack, with the following distribution:

Java Edition:

Structure type	Identifier
Jigsaw	jigsaw

Structure	Identifier
Trial Chambers	trial_chambers

Bedrock Edition:

Structure type	Identifier
Jigsaw	jigsaw

Structure	Identifier	Translation key
Trial Chambers	trial_chambers	feature.trial_chambers

October 15, 2023							Trial chambers are announced at Minecraft Live 2023.
November 6, 2023							Trial chambers are teased in a minecraft.net blog post.

Java Edition
1.20.3 Experiment Update 1.21			23w45a				Added trial chambers behind the "Update 1.21" experimental data pack.
1.20.5 Experiment Update 1.21			24w05a				Vaults now generate in trial chambers.
			24w07a				Trial spawners surrounded by bone block and podzol now spawn bogged instead of skeletons with arrows of Poison in their offhands.
			24w11a				Added new chambers and variations, with new challenges.
							Added flow, guster, and scrape pottery sherds to the decorated pots in the decor structure pool.
							Changed the layout of the blocks around vaults.
							Remade chamber_3 and chamber_9 and renamed them to pedestal and slanted, respectively.
			24w12a				Trial chambers now generate slightly more rarely and a bit more spaced out from each other.
			24w13a				Ominous vaults now generate in trial chambers.
							Loot, amount, layout and placement of trial spawners and vaults has been adjusted.
							Changed the layout of straight_7, straight_8, end_1, end_2, intersection_1, pedestal and slanted.
							Added an atrium to the corridors.
							Remade chamber_5 and renamed it to eruption.
			pre1				Trial chambers are now more consistently buried by terrain when found underground.
							Remade chamber_6 and renamed it to assembly.
							Added a new trap dispenser style to chambers.
							Fixed various broken jigsaw connections in the corridors.
							In chamber 'Eruption', stopped tuff bricks from spawning in the air.
							In chamber 'Eruption', added more lights to quadrants.
1.21			24w18a				Trial chambers are now available without using the "Update 1.21" experimental data pack.
							Made various layout changes in intersections and corridors.
							Added new trap dispenser style to chambers.
							Added new entrance variations.
							Added empty chests to chamber entrances.
			24w21a				Trial chambers are less likely to generate in the deep dark.
1.21.2			24w33a				Beds in intersections now have their colors randomized.
							Removed the oak tree in corridor/entrance_1.
							Tweaked the corridor/straight_6.
							Added "Encounter" room types that generate in hallways.
							Replaced empty chests at chamber entrances with hoppers above barrels embedded into the wall.
							Removed chamber/slanted/hallway_4 and chamber/slanted/hallway_5.
							Some slime trial spawners are moved to allow spawning without terrain modification.
							Traps no longer generate behind walls, making them more accessible.
							Fixed ominous vaults failing to generate at chamber pedestal, chamber_1, and chamber_2.
			Release Candidate 1				The chest loot at corridor/end_2 now generates correctly.[9]

Bedrock Edition
1.20.60 Experiment Update 1.21			Preview 1.20.60.20				Added trial chambers behind the "Update 1.21" experimental toggle.
1.20.70 Experiment Update 1.21			Preview 1.20.70.21				Vaults now generate in trial chambers.
			Preview 1.20.70.24				Trial chambers now generate in the same locations as in Java Edition.
							Trial spawners surrounded by bone block and podzol now spawn bogged instead of skeletons with arrows of Poison in their offhands.
1.20.80 Experiment Update 1.21			Preview 1.20.80.20				Trial chambers now generate in the same configurations as in Java Edition.
			Preview 1.20.80.22				Added new chambers and variations, with new challenges.
							Remade chamber_3 and chamber_9 and renamed them to pedestal and slanted, respectively.
							Trial spawners now generate more frequently in corridors.
							Decorated pots in trial chambers can now generate with "flow", "guster", and "scrape" pottery sherds.
							Changed the blocks surrounding vaults from waxed blocks of copper and waxed chiseled copper to polished andesite and chiseled tuff bricks.
							Updated loot tables for trial chambers vaults, removing horse armor and saddles and adding wind charges, "bolt armor trim" and "flow armor trim" smithing templates, "flow" and "guster" banner patterns, and heavy cores.
1.21.0 Experiment Update 1.21			Preview 1.21.0.20				Trial chambers now generate slightly more rarely and a bit more spaced out from each other.
							Ominous vaults now generate in trial chambers.
							Loot, amount, layout and placement of trial spawners and vaults has been adjusted.
							Changed the layout of intersections and corridors.
							Remade chamber_5 and renamed it to eruption.
			Preview 1.21.0.21				Trial chambers are now more consistently buried by terrain when found underground.
1.21.0			Preview 1.21.0.22				Trial chambers are now available without using the "Update 1.21" experimental toggle.
			Preview 1.21.0.23				Remade chamber_6 and renamed it to assembly.
							Added a new trap dispenser style to chambers.
							Fixed various broken jigsaw connections in the corridors.
							Added new intersection variation.
							In chamber 'Eruption', added missing water bucket into dispenser.
							Added new wall dispenser style.
			Preview 1.21.0.24				Removed the TNT trap in the Eruption chamber (chamber/eruption).
							Fixed the seams in corridors so they now match.
							Added new entrance variations.
							Fixed various broken or incorrect jigsaw data.
							Added empty chests to the entrances of some chambers.​[more information needed]
1.21.20			Preview 1.21.10.20				Trial chambers now generate far less frequently in the deep dark biome.
1.21.30			Preview 1.21.30.21				Added "Encounter" room types that generate in hallways.
							Replaced empty chests at chamber entrances with hoppers above barrels embedded into the wall.
			Preview 1.21.30.24				"Encounters" no longer generate in hallways.

Issues relating to "Trial Chambers" are maintained on the bug tracker. Issues should be reported and viewed there.

• The idea of trial chambers evolved from CornerHard pitching in a meeting to revisit the monster room.^[10]
• The design of trial chambers was inspired by the architecture of Mesoamerican civilizations, whose geometric designs fit well into Minecraft. The design combines the aesthetic of ancient civilizations with a futuristic feel.^[11]
• A scrapped chamber design appears in two YouTube videos showcasing the trial chambers and the trial spawners.^[12][13] It includes a trial spawner, two chests, and two redstone lamps with levers on top.
• Brandon Pearce thinks that whoever created trial chambers in-universe seem to be "pretty tinkery".^[14]
• There are around 4,500 copper blocks in an average trial chamber. If these were all mined and converted to copper ingots, this would be approximately 40,000 copper ingots.

• 
  The main corridor in trial chambers
• 
  An intersection room featuring 4 beds and a loot barrel
• 
  An atrium inside the trial chambers
• 
  An encounter inside the trial chambers
• 
  A trial chamber covered in sculk veins
• 
  A monster room connected to trial chambers
• 
  Another monster room in a trial chamber
• 
  An amethyst geode, mineshaft and a monster room together in a trial chamber within a lush cave
• 
  Ruined portal generated inside a trial chamber
• 
  A mural on a wall depicting the face of a bogged
• 
  The Trial Chambers seed template thumbnail.
• 
  A mural on a wall depicting the face of a breeze
• 
  A mural on a wall depicting the face of a spider
• 
  A mural on a wall depicting a spiral design
• 
  A screenshot where Trial Spawner pedestals break through bedrock in a superflat world upgraded from a pre-1.18 version

• 
  Trial chamber room
• 
  Trial chamber fountain room
• 
  Trial chamber corridor
• 
  Dispensers in a trial chamber
• 
  A corridor inside a trial chamber
• 
  A corridor of the trial chamber
• 
  The second floor of a trial chamber
• 
  A view of a corridor
• 
  An ominous vault
• 
  A staircase at the end of a trial chamber hallway
• 
  A trap featuring a dispenser and two tripwires
• 
  A large room with a trial spawner in the middle
• 
  A trial chamber corridor with a trial spawner on the balcony
• 
  Trial chambers encapsulated in stone
• 
  Trial chambers not using the encapsulate terrain adaption type
• 
  Trial chambers in a lush caves biome
• 
  A vertical room with a vault
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  Sunny in the trial chambers
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  Efe using a bow
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  Makena using a wind charge in the trial chambers
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  Ditto
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  Noor using a mace in the trial chambers
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  Another shot of Noor
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  Decorated intersection/intersection 3
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  An entrance with a water fountain in the trial chamber
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  A bedroom in the trial chamber
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  A well decorated trial chamber
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  Music & painting in the trial chamber
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  Alex and Kai in trial chambers
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  Kai jumps across platforms in trial chambers
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  A trial chambers disposal unit

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  Tricky Trials key art, featuring trial chambers
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  Ari, Noor, and Efe looting a trial spawner and receiving trial keys
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  Alex faces a breeze in trial chambers.
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  A breeze fires a wind charge.
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  Alex gets knocked back
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  Alex falls off the platform while the breeze watches.
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  Ari and Sunny entering the trial chambers
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  Ari and Sunny fighting husks
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  Ari and Sunny open a vault.
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  Steve, Makena, and many mobs caught in an explosion in the trial chambers
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  An active trial
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  Steve, Alex, Efe, Sunny, Kai, and Makena entering a trial chamber through a hole
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  Steve and a wolf fighting several bogged
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  Another shot of an active trial
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  A Lego Minecraft trial chamber.

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  Trial chambers concept arts
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  Ditto
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  Ditto
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  Ditto
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  Ditto

• Building Blocks: Trial Chamber – Minecraft.net on September 19, 2024
• "Trial Chamber prepping" by Per Landin – Minecraft.net, June 4, 2024.
• "Into the Trial Chambers: Weapons and Armor" by Duncan Geere – Minecraft.net, June 11, 2024.
• "The Chamber of Secrets" by Per Landin – Minecraft.net, June 18, 2024.
• "The rewards of Tricky Trials" by Sophie Austin – Minecraft.net, June 26, 2024.