Trial Spawners

A trial spawner configuration decides what a trial spawner block spawns, how many mobs it spawns per player, how fast, and which loot tables it ejects once the players beat it. A trial spawner block points to one configuration for its normal state and one for its ominous state, so a custom trial chamber can mix vanilla and custom configurations freely.

File Structure

data/<namespace>/trial_spawner/<name>.json

Creating a Configuration

Use trialSpawner on your DataPack. Every field is optional, the game falling back to its defaults: a 4 block spawn range, 6 total mobs, 2 simultaneous mobs, 40 ticks between spawns and the vanilla reward loot tables.

val skeletonArchers = dp.trialSpawner("skeleton_archers") {
	simultaneousMobs = 3f
	simultaneousMobsAddedPerPlayer = 0.5f
	ticksBetweenSpawn = 20
	totalMobs = 8f

	spawnPotential(EntityTypes.SKELETON, weight = 3) {
		equipment(LootTables.Equipment.TRIAL_CHAMBER_RANGED, 0f)
	}
	spawnPotential(EntityTypes.STRAY) {
		equipment(LootTables.Equipment.TRIAL_CHAMBER_RANGED, mapOf(EquipmentSlot.HEAD to 0.5f))
	}
}

Property	Default	Description
`itemsToDropWhenOminous`	vanilla loot table	Loot table of the items dropped around players when ominous.
`lootTablesToEject`	vanilla key/consumables	Weighted reward loot tables, see `lootTableToEject`.
`simultaneousMobs`	`2`	Mobs alive at the same time for a single player.
`simultaneousMobsAddedPerPlayer`	`1`	Extra simultaneous mobs for each additional player.
`spawnPotentials`	none	Weighted mobs to spawn, see `spawnPotential`.
`spawnRange`	`4`	Spawn distance from the spawner, from `1` to `128`.
`ticksBetweenSpawn`	`40`	Delay between two spawns.
`totalMobs`	`6`	Mobs to defeat for a single player.
`totalMobsAddedPerPlayer`	`2`	Extra mobs to defeat for each additional player.

Spawned Mobs

spawnPotential adds a weighted mob, its block customizing what gets spawned:

entity { } adds NBT to the spawned entity, its id being always kept.
equipment(lootTable, slotDropChance) rolls the mob's equipment from a loot table, each slot dropping with the same chance. Pass a Map<EquipmentSlot, Float> instead to set a chance per slot.
customSpawnRules(blockLightLimit, skyLightLimit) replaces the mob's own spawn rules with light ranges, like 0..7.

dp.trialSpawner("slimes") {
	spawnPotential(EntityTypes.SLIME, weight = 3) {
		entity { this["Size"] = 1 }
	}
	spawnPotential(EntityTypes.SLIME) {
		entity { this["Size"] = 2 }
		customSpawnRules(blockLightLimit = 0..7)
	}
}

Rewards

lootTableToEject adds a weighted loot table ejected for each player once the trial is beaten, replacing the vanilla ones.

dp.trialSpawner("ominous_breezes") {
	itemsToDropWhenOminous = LootTables.Spawners.TrialChamber.ITEMS_TO_DROP_WHEN_OMINOUS
	lootTableToEject(LootTables.Spawners.Ominous.TrialChamber.KEY, weight = 3)
	lootTableToEject(LootTables.Spawners.Ominous.TrialChamber.CONSUMABLES, weight = 7)
	spawnPotential(EntityTypes.BREEZE)
}

Produces JSON:

{
	"items_to_drop_when_ominous": "minecraft:spawners/trial_chamber/items_to_drop_when_ominous",
	"loot_tables_to_eject": [
		{
			"data": "minecraft:spawners/ominous/trial_chamber/key",
			"weight": 3
		},
		{
			"data": "minecraft:spawners/ominous/trial_chamber/consumables",
			"weight": 7
		}
	],
	"spawn_potentials": [
		{
			"data": {
				"entity": {
					"id": "minecraft:breeze"
				}
			},
			"weight": 1
		}
	]
}

Reference: Trial spawner configuration

Published23/09/2026Last updated23/09/2026

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