Trial Chambers

Trial Chambers are rare underground structures introduced in Minecraft 1.21. They generate below Y=0 in newly created chunks, forming a grid-like layout of interconnected rooms and corridors made from copper and tuff blocks.

They are the only natural source of Trial Spawners, Vaults, Breezes, and key items like Breeze Rods, Heavy Cores, and Wind Charges, used to craft maces and other gear. Players can trigger Ominous Trials by entering with a Bad Omen, causing tougher mobs to spawn and unlocking improved loot.

The layout includes entrances, hallways, intersections, chambers, and atriums. Chambers feature combat encounters with mobs like zombies, skeletons, and breezes, which scale in difficulty depending on player count. Trial Spawners drop Trial Keys, used to open Vaults containing rare loot such as enchanted gear, diamonds, templates, and unique banner patterns.

Trial Chambers also include decorated pots, dispenser traps, loot barrels, and chests, with loot scaling based on location and challenge level. Each structure is a mid-game combat dungeon offering valuable resources and exclusive rewards for prepared players.

Renewable

Loot Tables for Trial Chambers

Vaults


Wind Charge	40.3%	1.57	2.5
Emerald	39.7%	1.42	2.5
Arrow	37.8%	2.24	2.6
Arrow of Poison	37.8%	2.24	2.6
Iron Ingot	29.6%	0.84	3.4
Honey Bottle	29.6%	0.50	3.4
Diamond	10.7%	0.17	9.3
Ominous Bottle	10.3%	0.11	9.7
Ominous Bottle (II)	10.3%	0.11	9.7
Golden Apple	8.3%	0.08	12.0
Bolt Armor Trim	6.2%	0.06	16.0
Music Disc Precipice	4.2%	0.04	24.0
Guster Banner Pattern	4.2%	0.04	24.0
Shield	2.6%	0.03	38.3
Enchanted Bow	2.6%	0.03	38.3
Trident	2.1%	0.02	48.0
Golden Carrot	1.7%	0.03	57.5
Enchanted Crossbow	1.7%	0.02	57.5
Enchanted Iron Axe	1.7%	0.02	57.5
Enchanted Iron Chestplate	1.7%	0.02	57.5
Enchanted Diamond Axe	0.9%	<0.01	115.0
Enchanted Diamond Chestplate	0.9%	<0.01	115.0
Mending	0.34%	<0.01	294.1
Riptide	0.34%	<0.01	294.1
Loyalty	0.34%	<0.01	294.1
Channeling	0.34%	<0.01	294.1
Impaling	0.34%	<0.01	294.1
Sharpness	0.28%	<0.01	357.1
Bane of Arthropods	0.28%	<0.01	357.1
Efficiency	0.28%	<0.01	357.1
Fortune	0.28%	<0.01	357.1
Silk Touch	0.28%	<0.01	357.1
Feather Falling	0.28%	<0.01	357.1

Ominous Vaults


Emerald	56.2%	5.13	1.8
Wind Charge	47.4%	5.87	2.1
Arrow of Slowness (IV)	37.5%	3.52	2.7
Diamond	26.4%	0.73	3.8
Flow Armor Trim	22.5%	0.23	4.4
Enchanted Golden Apple	22.5%	0.23	4.4
Flow Banner Pattern	15.0%	0.15	6.7
Block of Emerald	13.8%	0.14	7.2
Enchanted Crossbow	11.0%	0.11	9.1
Block of Iron	11.0%	0.11	9.1
Golden Apple	8.3%	0.08	12.1
Enchanted Diamond Axe	8.3%	0.08	12.1
Enchanted Diamond Chestplate	8.3%	0.08	12.1
Music Disc Creator	7.5%	0.07	13.3
Heavy Core	7.5%	0.07	13.3
Wind Burst	5.5%	0.06	18.1
Ominous Bottle (III)	4.63%	0.05	21.6
Ominous Bottle (IV)	4.63%	0.05	21.6
Ominous Bottle (V)	4.63%	0.05	21.6
Block of Diamond	2.8%	0.03	36.2
Breach	2.75%	0.03	36.4
Density	2.75%	0.03	36.4
Knockback	1.1%	0.01	90.9
Punch	1.1%	0.01	90.9
Smite	1.1%	0.01	90.9
Looting	1.1%	0.01	90.9
Multishot	1.1%	0.01	90.9

Entrance Chest


Arrow	55.1%	5.21	1.8
Honeycomb	55.1%	3.47	1.8
Wooden Axe	55.1%	0.69	1.8
Stick	31.0%	1.22	3.2
Trial Key	6.8%	0.07	14.7

Intersection Chest


Amethyst Shard	39.7%	6.51	2.5
Cake	39.7%	1.16	2.5
Block of Iron	39.7%	0.70	2.5
Diamond	21.5%	0.35	4.6
Block of Emerald	11.2%	0.23	8.9
Diamond Axe	11.2%	0.12	8.9
Diamond Pickaxe	11.2%	0.12	8.9
Block of Diamond	2.3%	0.02	43.3

Supply Chest


Arrow	37.3%	4.00	2.7
Glow Berries	37.3%	2.67	2.7
Baked Potato	37.3%	1.33	2.7
Stone Pickaxe	37.3%	0.44	2.7
Tuff	20.4%	1.67	4.9
Arrow of Poison	20.4%	1.33	4.9
Arrow of Slowness	20.4%	1.33	4.9
Acacia Planks	20.4%	1.00	4.9
Torch	20.4%	1.00	4.9
Bone Meal	20.4%	0.78	4.9
Moss Block	20.4%	0.78	4.9
Potion of Regeneration (0:45)	20.4%	0.44	4.9
Potion of Strength (3:00)	20.4%	0.44	4.9
Milk Bucket	20.4%	0.22	4.9

Intersection Barrels


Bamboo Planks	49.3%	6.06	2.0
Baked Potato	49.3%	4.85	2.0
Golden Axe	22.3%	0.24	4.5
Golden Pickaxe	22.3%	0.24	4.5
Diamond	5.9%	0.12	16.8
Bucket	5.9%	0.09	16.8
Compass	5.9%	0.06	16.8
Diamond Pickaxe	5.9%	0.06	16.8
Enchanted Diamond Axe	5.9%	0.06	16.8

Corridor Barrels


Tuff	28.4%	4.42	3.5
Scaffolding	19.6%	1.26	5.1
Bamboo Planks	19.6%	0.95	5.1
Torch	19.6%	0.95	5.1
Bamboo Hanging Sign	19.6%	0.53	5.1
Ender Pearl	19.6%	0.32	5.1
Stone Axe	19.6%	0.21	5.1
Stone Pickaxe	19.6%	0.21	5.1
Honeycomb	10.2%	0.53	9.8
Enchanted Iron Axe	10.2%	0.10	9.8

Decorated Pots


Emerald	35.6%	0.71	2.8
Arrow	28.5%	1.43	3.5
Iron Ingot	28.5%	0.43	3.5
Trial Key	2.8%	0.03	35.1
Diamond	1.4%	0.02	70.2
Block of Emerald	1.4%	0.01	70.2
Music Disc Creator (Music Box)	1.4%	0.01	70.2
Block of Diamond	0.3%	<0.01	351.0

Dispensers


Fire Charge	20.7%	1.24	4.8
Snowball	20.7%	1.24	4.8
Arrow	13.8%	0.83	7.2
Water Bucket	13.8%	0.14	7.2
Egg	6.9%	0.41	14.5
Lingering Potion of Healing	3.4%	0.12	29.0
Lingering Potion of Poison (0:11)	3.4%	0.12	29.0
Lingering Potion of Slowness	3.4%	0.12	29.0
Lingering Potion of Weakness	3.4%	0.12	29.0
Splash Potion of Poison (0:45)	3.4%	0.12	29.0
Splash Potion of Slowness (1:30)	3.4%	0.12	29.0
Splash Potion of Weakness (1:30)	3.4%	0.12	29.0

Corridor Dispenser


Arrow	100.0%	6.00	1.0

Water Dispenser


Water Bucket	100.0%	1.00	1.0

Trial Spawners


Trial Key	50.0%	0.50	2.0
Bread	15.0%	0.30	6.7
Cooked Chicken	15.0%	0.15	6.7
Baked Potato	10.0%	0.20	10.0
Potion of Regeneration (0:45)	5.0%	0.05	20.0
Potion of Swiftness (3:00)	5.0%	0.05	20.0

Ominous Trial Spawners


Ominous Trial Key	30.0%	0.30	3.3
Baked Potato	21.0%	0.63	4.8
Steak	21.0%	0.32	4.8
Golden Carrot	14.0%	0.21	7.1
Potion of Regeneration (0:45)	7.0%	0.07	14.3
Potion of Strength (3:00)	7.0%	0.07	14.3