Trial Spawner

For the ominous variant, see Ominous Trial Spawner.

Trial Spawner

Renewable	No
Stackable	Yes (64)
Tool	Any tool
Blast resistance	50
Hardness	50
Luminous	Yes, when not inactive Waiting for players: 4 Active: 8
Transparent	Partial
Flammable	No
Catches fire from lava	No
Map color	11 STONE
Note block instrument	Bass Drum

A trial spawner is a type of spawner found in trial chambers. It spawns mobs in waves, ejects consumable items and/or trial keys after they are all defeated, and then deactivates for 30 minutes. Having more Survival/Adventure mode players nearby results in more mobs and more rewards.

A trial spawner will convert into an active ominous trial spawner during an ominous trial, even if it was on cooldown.

Obtaining

Trial spawners can be obtained only by using the Creative inventory, using pick block or executing commands.

Natural generation

Trial spawners generate naturally in every chamber and every corridor of trial chambers, except for the entrance and intersection chambers.

Breaking

No tool can accelerate the breaking process of trial spawner.

Block	Trial Spawner
Hardness	50
Breaking time (secs)
Default	175.05 (JE) 75 (BE)
Options
Efficiency	000
Haste	001 1JEBE

Legend

• incorrect tool, drops nothing
• correct tool, drops nothing or something other than the block itself
• correct tool, drops the block itself
• italicized can be instant mined

Trial spawner drops nothing when it's destroyed.

Usage

A trial spawner summons a limited number of mobs, scaled based on the number of nearby players. When these mobs are defeated, the spawner ejects a reward for each player and enters a cooldown period.

Activation

A trial spawner has a required player range of 14 blocks. Any player in Survival or Adventure mode activates the spawner if the distance between the player's center and the spawner's center becomes less than the required player range, and the spawner has a direct line of sight to the player (even if the player is invisible). Once activated, the spawner begins summoning copies of the mob set in it, and no longer requires the player to be within range or maintain line of sight.

The line of sight check for trial spawners cannot pass through visual box. This differs from the line of sight check used in mob AI, which cannot pass through collision box.

Trial spawners do not activate if the game rule spawn_mobs‌^{[JE only]} or domobspawning‌^{[BE only]} is false,^{[1][verify for Bedrock Edition]}, spawner_blocks_work is false, or if the difficulty is set to Peaceful.^{[2][verify for Bedrock Edition]}

When a trial spawner first activates, it shoots spark-like particles up into the air. While active, it emits smoke and flame particles around itself and any entities it summons.

The light level around a trial spawner does not affect how it summons entities.

Mob spawning

When a player enters a trial spawner's range, the spawner attempts to spawn 1 mob every 40 game ticks (2 seconds). With 1 player, it does not spawn a mob if there are already 2 mobs from the spawner that are still alive. It spawns a total of 6 mobs before ejecting loot and going into cooldown. The number of living mobs required to prevent further mob spawning is called the simultaneous mob count. The number of mobs spawned before going into cooldown is the total mob count. These numbers are summarized in § Spawning values.

This duration of time between each mob being spawned is the spawn interval. If the spawner can't spawn a mob, it waits for the duration of the spawn interval and tries again. Once the number of living mobs spawned by the spawner has reached the simultaneous mob count, it stops trying to spawn mobs. Mobs spawned by the spawner do not naturally despawn, but the spawner does not detect or count living mobs from unloaded chunks. Therefore, moving mobs into unloaded chunks causes them to build up and the spawner to continue spawning more.

A trial spawner also stops spawning mobs if the number of living mobs spawned by it reached the total mob count. The spawner doesn't need to detect these mobs being alive, and therefore still counts them if they are in unloaded chunks. The spawner detects the death of the mobs only for the total mob count, and it always detects the death of the mobs even if it is not in a loaded chunk.

Both the simultaneous mob count and the total mob count increase if another player comes within the spawner's range. For each additional player present, the simultaneous mob count increases by 1, and the total mob count increases by 2. For example, with 2 players, 8 mobs spawn in total with 3 at once, and with 3 players, 10 mobs spawn in total with 4 at once.

If a player leaves the detection range of a trial spawner, these values do not scale back down.

The values described above are the default values used when trial spawners are placed manually. Naturally generated spawners in trial chambers use different values. Additionally, these numbers can be configured by modifying the block's NBT data.

Naturally generating trial spawners in trial chambers use different values for the spawn interval, the total mob count, and the simultaneous mob count. The quantity that the last 2 values change by with additional players is also different for different types of spawners. All naturally generated spawners attempt to spawn mobs every 20 game ticks (1 second), or every 160 game ticks (8 seconds) for the slow versions of the spawners. Additionally, naturally generated breeze spawners allow 1 breeze to exist at once (+0.5 for each additional player present) and stop after spawning 2 mobs (+1 for each additional player present). Baby zombie spawners allow 2 baby zombies to exist at once (+0.5 for each additional player present) and stop after spawning 6 mobs (+2 for each additional player present). All other spawners generated in trial chambers use the default value of 6 total mobs, plus 2 for each additional player present, and 3 simultaneous mobs, plus 2 for each additional player present. This is summarized in § Spawning values.

Spawning values

Mobs spawn in positions that have a line of sight to the trial spawner, in a 4-block spherical radius. This is different from the monster spawner, which has a larger, rectangular spawning box, and no line-of-sight requirement. Otherwise, the standard mob spawning rules apply (mobs cannot collide with blocks, guardians and elder guardians spawn only in water, etc.)

Completion

All mobs spawned by a trial spawner must be defeated before the trial spawner can eject loot. A mob is considered defeated when it is killed, enters a block (in the case of silverfish), enters another dimension, or transforms into another entity (excepting for creepers transforming into charged creepers; the charged creepers must be defeated before the trial spawner is completed).

If a mob spawns more mobs upon death, only the initial mob must be defeated to cause the spawner to eject loot (i.e. slimes and magma cubes).

Cooldown

Upon completion, a trial spawner enters a cooldown state for 30 minutes (36000 game ticks) before it can be activated again. The cooldown timer decreases even if the trial spawner is unloaded.^[3]

Custom trial spawners

Using a spawn egg on a trial spawner sets the trial spawner's type to that egg's entity. If a spawn egg is renamed on an anvil, then used on the spawner, all mobs from that spawner will be named.

Trial spawners placed by players have the same loot data as those found in trial chambers. However, if it becomes an ominous trial spawner it will keep its same loot and will not update to use the Ominous loot.

Loot

When all mobs have been killed, the trial spawner waits 40 ticks (2 seconds). Then, every 30 ticks (1.5 seconds), it ejects random items from the loot table. It does this for every detected player. It has a 50% chance of picking a 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:

Item	Stack Size	Weight	Chance	Avg. per spawner	Avg. # spawners to defeat
Trial Key	1	10⁄20	50.0%	0.500	2.0
Bread	1–3	3⁄20	15.0%	0.300	6.7
Cooked Chicken	1	3⁄20	15.0%	0.150	6.7
Baked Potato	1–3	2⁄20	10.0%	0.200	10.0
Potion of Regeneration	1	1⁄20	5.0%	0.050	20.0
Potion of Swiftness	1	1⁄20	5.0%	0.050	20.0

{ "chestNames": [ "trial-chambers-trial-spawner" ], "gameVersion": "Java", "loot": { "trial-chambers-trial-spawner": { "poolsJava": [ { "items": { "baked-potato": [ 1, 3, 2 ], "cooked-chicken": [ 1, 1, 3 ], "potion-of-regeneration": [ 1, 1, 1 ], "bread": [ 1, 3, 3 ], "potion-of-swiftness": [ 1, 1, 1 ], "trial-key": [ 1, 1, 10 ] }, "rolls": [ 1, 1 ], "totalweight": 20 } ], "poolsBedrockUpcoming": [], "itemDataJava": { "baked-potato": { "itemname": "baked-potato", "sizes": [ "1–3" ], "sortsize": [ 2 ], "sortweight": [ 2 ], "weights": [ "<sup>2</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.2, "chanceany": 0.09999999999999998 }, "cooked-chicken": { "itemname": "cooked-chicken", "sizes": [ 1 ], "sortsize": [ 1 ], "sortweight": [ 3 ], "weights": [ "<sup>3</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.15, "chanceany": 0.15000000000000002 }, "potion-of-regeneration": { "sortsize": [ 1 ], "weights": [ "<sup>1</sup>&frasl;<sub>20</sub>" ], "chanceany": 0.050000000000000044, "sizes": [ 1 ], "sortweight": [ 1 ], "armor": 0, "material": 0, "avgamount": 0.05, "itemname": "potion-of-regeneration" }, "bread": { "itemname": "bread", "sizes": [ "1–3" ], "sortsize": [ 2 ], "sortweight": [ 3 ], "weights": [ "<sup>3</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.3, "chanceany": 0.15000000000000002 }, "potion-of-swiftness": { "sortsize": [ 1 ], "weights": [ "<sup>1</sup>&frasl;<sub>20</sub>" ], "chanceany": 0.050000000000000044, "sizes": [ 1 ], "sortweight": [ 1 ], "armor": 0, "material": 0, "avgamount": 0.05, "itemname": "potion-of-swiftness" }, "trial-key": { "itemname": "trial-key", "sizes": [ 1 ], "sortsize": [ 1 ], "sortweight": [ 10 ], "weights": [ "<sup>10</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.5, "chanceany": 0.5 } }, "superheader": "[[Trial Chambers]]", "poolsJavaUpcoming": [], "structure": "Trial Chambers", "container": "Trial spawner", "itemDataJavaUpcoming": [], "allRollsJavaUpcoming": [], "itemDataBedrock": { "baked-potato": { "itemname": "baked-potato", "sizes": [ "1–3" ], "sortsize": [ 2 ], "sortweight": [ 2 ], "weights": [ "<sup>2</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.2, "chanceany": 0.09999999999999998 }, "cooked-chicken": { "itemname": "cooked-chicken", "sizes": [ 1 ], "sortsize": [ 1 ], "sortweight": [ 3 ], "weights": [ "<sup>3</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.15, "chanceany": 0.15000000000000002 }, "potion-of-regeneration": { "sortsize": [ 1 ], "weights": [ "<sup>1</sup>&frasl;<sub>20</sub>" ], "chanceany": 0.050000000000000044, "sizes": [ 1 ], "sortweight": [ 1 ], "armor": 0, "material": 0, "avgamount": 0.05, "itemname": "potion-of-regeneration" }, "bread": { "itemname": "bread", "sizes": [ "1–3" ], "sortsize": [ 2 ], "sortweight": [ 3 ], "weights": [ "<sup>3</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.3, "chanceany": 0.15000000000000002 }, "potion-of-swiftness": { "sortsize": [ 1 ], "weights": [ "<sup>1</sup>&frasl;<sub>20</sub>" ], "chanceany": 0.050000000000000044, "sizes": [ 1 ], "sortweight": [ 1 ], "armor": 0, "material": 0, "avgamount": 0.05, "itemname": "potion-of-swiftness" }, "trial-key": { "itemname": "trial-key", "sizes": [ 1 ], "sortsize": [ 1 ], "sortweight": [ 10 ], "weights": [ "<sup>10</sup>&frasl;<sub>20</sub>" ], "avgamount": 0.5, "chanceany": 0.5 } }, "poolsBedrock": [ { "items": { "baked-potato": [ 1, 3, 2 ], "cooked-chicken": [ 1, 1, 3 ], "potion-of-regeneration": [ 1, 1, 1 ], "bread": [ 1, 3, 3 ], "potion-of-swiftness": [ 1, 1, 1 ], "trial-key": [ 1, 1, 10 ] }, "rolls": [ 1, 1 ], "totalweight": 20 } ], "allRollsBedrockUpcoming": [], "allRollsBedrock": [ 1 ], "itemDataBedrockUpcoming": [], "chest_type": "trial spawner", "header": "Spawner", "display": "trial chambers trial spawner", "allRollsJava": [ 1 ], "structID": "trial-chambers" } } }

Ominous trial

A player with Bad Omen that is within the activation range of a trial spawner is given the Trial Omen effect, starting an ominous trial. During an ominous trial, trial spawners near a player with Trial Omen are converted into ominous trial spawners. When a trial spawner becomes ominous, all of its existing mobs are despawned. If the trial spawner was on cooldown and was not ominous before going on cooldown, the cooldown is skipped when becoming ominous.

Piston interactivity

Trial spawner can't be pushed by pistons or pulled by sticky pistons.

Sounds

Generic

Java Edition:

trial_spawner sound type
Sound	Closed captions	Source	Description	Identifier	Translation key	Volume	Pitch	Attenuation distance
	​Block broken	Blocks	Once the block has been broken	block.trial_spawner.break	subtitles.block.generic.break​	0.9	0.8	16
	​Block placed​[until: JE 26.4]	Blocks	When the block is placed	block.trial_spawner.place	subtitles.block.generic.place​	1.0	0.8	16
	​Block breaking	Blocks	While the block is in the process of being broken	block.trial_spawner.hit	subtitles.block.generic.hit​	0.25	0.5	16
	​Something falls on a block	Entity-Dependent	Falling on the block with fall damage	block.trial_spawner.fall	subtitles.block.generic.fall​	0.5	0.75	16
	​Footsteps	Entity-Dependent	Walking on the block	block.trial_spawner.step	subtitles.block.generic.footsteps​	0.15	1.0	16

Bedrock Edition:

trial_spawner sound type
Sound	Closed captions	Source	Description	Identifier	Translation key	Volume	Pitch
	​ ?	Blocks	Once the block has broken	trial_spawner.break	​ ?	1.0	0.8
	​ ?	Blocks	When the block is placed	trial_spawner.place	​ ?	1.0	0.8
	​ ?	Blocks	While the block is in the process of being broken	trial_spawner.hit	​ ?	0.38	0.5
	​ ?	Blocks	Falling on the block with fall damage	trial_spawner.step	​ ?	0.4	1.0
	​ ?	Blocks	Walking on the block	trial_spawner.step	​ ?	0.15	1.0
	​ ?	Blocks	Jumping from the block	trial_spawner.step	​ ?	0.12	1.0
	​ ?	Blocks	Falling on the block without fall damage	trial_spawner.step	​ ?	0.2	1.0

Unique

Java Edition

Bedrock Edition:

Data values

ID

Java Edition:

Name	Identifier	Form	Translation key
Trial Spawner	trial_spawner	Block & Item	block.minecraft.trial_spawner

Name	Identifier
Block entity	trial_spawner

Bedrock Edition:

Name	Identifier	Numeric ID	Form	Item ID[i 1]	Translation key
Trial Spawner	trial_spawner	-315	Block & Giveable Item[i 2]	Identical[i 3]	tile.trial_spawner.name

Name	Savegame ID
Block entity	TrialSpawner

Block states

Java Edition:

Bedrock Edition:

Block data

A trial spawner has a block entity associated with it that holds additional data about the block.

Java Edition:

Bedrock Edition:

See Bedrock Edition level format/Block entity format.

Advancements

Icon	Advancement	In-game description	Actual requirements (if different)
	How Did We Get Here?	Have every effect applied at the same time	Have all of these 34​[until: Fourth Drop 2026]/35​[upcoming] status effects applied to the player at the same time: Absorption Bad Omen Blindness Breath of the Nautilus Conduit Power Darkness Dolphin's Grace Fire Resistance Freezing Glowing Haste Hero of the Village Hunger Infested Invisibility Jump Boost Levitation Mining Fatigue Nausea Night Vision Oozing Poison Raid Omen Regeneration Resistance Slow Falling Slowness Speed Strength Trial Omen Water Breathing Weakness Weaving Wind Charged Wither The source of the effects is irrelevant for the purposes of this advancement. Other status effects may be applied to the player, but are ignored for this advancement. This is a hidden advancement, meaning that it can be viewed by the player only after completing it, regardless of if its child advancement(s), if any, have been completed.

Videos

History

Announcement

October 15, 2023							Trial spawners are announced at Minecraft Live 2023.

Java Edition

Java Edition
1.20.3 Experiment Update 1.21			23w45a				Added trial spawners.
1.20.5 Experiment Update 1.21			24w04a				No longer ignores the custom_spawn_rules data field.
			24w11a				Now appears more frequently in the trial chambers corridors.
			24w13a				Can now become an ominous trial spawner if the player who activates it has trial omen.
							The ejected loot table has been modified.
							Now increase the amount of mobs present at once by 0.5 for each additional player instead of 2.
							Baby Zombie spawners now have 2 mobs present at once to start with instead of 3.
							Can now activate only when a player is in line of sight.
			pre1				Updated textures to match ominous trial spawners.
1.21			24w18a				Trial spawners are now available without using the "Update 1.21" experimental data pack.
			24w19a				Updated textures to be more consistent across all states as well as the ominous trial spawner.
			pre2				Updated bottom texture to match Bedrock Edition.

Bedrock Edition

Bedrock Edition
1.20.60 Experiment Update 1.21			Preview 1.20.60.20				Added trial spawners.
1.21.0 Experiment Update 1.21			Preview 1.21.0.20				Can now become an ominous trial spawner if the player who activates it has trial omen.
							Can now activate only when a player is in line of sight.
1.21.0			Preview 1.21.0.22				Trial spawners are now available without using the "Update 1.21" experimental toggle.
							Updated textures to match ominous trial spawners as well as introduce a new design for the bottom face.
1.21.20			Preview 1.21.10.20				Updated textures to be more consistent across all states as well as the ominous trial spawner.
1.21.30			Preview 1.21.30.22				Trial spawner collision size is now a full block.[4]

Issues

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

Trivia

• Trial spawners placed by hand have both spawn_potentials and spawn_data data. Right clicking a trial spawner with a spawn egg changes its spawn_data. Changing its spawn_potentials without removing its spawn_data causes the trial spawner to stop functioning.
• If there are multiple entities listed within the spawn_potentials data of a trial spawner, the icon displayed by a trial spawner reflects the next entity to be spawned.
• The line of sight check for trial spawners was implemented to prevent mobs from spawning outside of the room, or outside trial chambers' structure, such as inside caves.^[5]
• Trial spawners can still eject their loot, even if all mobs they spawned were not defeated but rather converted as listed below:
  • Pigs and villagers converting to zombified piglins and witches respectively when struck by lightning.
  • Piglins, piglin brutes and hoglins converting to zombified piglins and zoglins when outside of the Nether for 15 seconds.
  • Skeletons converting into strays when they freeze.
  • Husks and zombies converting into zombies and drowned when submerged in water for too long.

Gallery

Renders

• 
  A breeze trial spawner
• 
  A slime trial spawner
• 
  A zombie trial spawner
• 
  A baby zombie trial spawner
• 
  A husk trial spawner
• 
  A skeleton trial spawner
• 
  A bogged trial spawner
• 
  A stray trial spawner
• 
  A spider trial spawner
• 
  A cave spider trial spawner
• 
  A silverfish trial spawner

Development images

• 
  A trial spawner emitting particles upon activation
• 
  A defeated breeze trial spawner
• 
  A room with a breeze trial spawner in the middle

In other media

• 
  Ari, Noor, and Efe looting a trial spawner and receiving trial keys
• 
  A spider trial spawner as it appears in the Tricky Trials Update Official Trailer
• 
  A bogged trial spawner activating before Efe, Kai, Makena, Steve, and Sunny

See also

• Vault

References

External links

• "Trial Spawner" by Duncan Geere – Minecraft.net, September 26, 2024.