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Sculk Catalyst

A sculk catalyst is a block that converts blocks around it to blocks in the sculk family (except for more sculk catalysts) when a mob that drops experience dies nearby.


Natural generation

Sculk catalysts are generated within the deep dark biome.

Chest loot

Item Structure Container Quantity Chance
Java Edition
Sculk Catalyst Ancient City Chest 1–2 16.1%
Bedrock Edition
Sculk Catalyst Ancient City Chest 1–2 16.1%

Mob loot

Wardens drop a single sculk catalyst upon death.


Sculk catalysts can be mined with any tool, but hoes are the quickest. It drops 5 experience if mined without Silk Touch.

Block Sculk Catalyst
Hardness 3
Breaking time[A]
Default 4.5
Wooden 2.25
Stone 1.15
Iron 0.75
Diamond 0.6
Netherite 0.5
Golden 0.4
  1. Times are for unenchanted tools as wielded by players with no status effects, measured in seconds. For more information, see Breaking § Speed.


Sculk catalyst activating.
Sculk catalyst activating.
Sculk catalyst detection range
Sculk catalyst detection range.
It turns the blocks around the dead Mob into Sculk or Sculk Vein.

If a mob dies within 8 blocks of a sculk catalyst, it blooms, giving off soul particles and creates a patch of sculk with sculk veins around that location. Blooming sculk can replace blocks in the sculk_replaceable tag, which includes the surface materials of most of the biomes in all three dimensions. If a mob is killed and detected by the sculk catalyst while over a sculk block, it may occasionally result in the growth of a sculk sensor.

The means of death of the mob is irrelevant; mobs can die from being killed by a player or tamed wolf, which yields experience, or by any other means, which does not yield experience; any kill is accepted by the catalyst. Rather than granting experience, a bubbling charge spawns where the mob died, and it travels through sculk until it finds a replaceable block. The strength of the sculk spreading depends on the amount of experience the mob would have dropped when it was killed by a player or a tamed wolf. Several sculk charges may end up on the same block and merge, up to 1000 charges per block.

If a mob dies and a charge is detected more than 4 blocks from a catalyst, a sculk block has a chance to use 10 experience to grow a sculk sensor or a sculk shrieker. A sculk sensor has a 9% chance to spawn and a sculk shrieker has a 1% chance to spawn. However, sculk sensors and sculk shriekers cannot spawn if there are 2 or more sensors within a 9×3×9 box with the bottom center of the box centered on the bubbling charge location (or within -4,0,-4 and 4,2,4 in relative coordinates).

A player dying can also affect the sculk catalyst, depending on how much experience the player has gathered. The sculk catalyst spreads a number of sculk blocks depending on player experience, with no spreading if a player dies with zero experience.

A sculk catalyst does not respond to the death of mobs that do not yield any experience, such as baby animals. It also does not respond to the ender dragon's death,[1] although this may be implemented in the future.[2]



Java Edition:

SoundSubtitlesSourceDescriptionResource locationTranslation keyVolumePitchAttenuation
Block brokenBlocksOnce the block has brokenblock.sculk_catalyst.breaksubtitles.block.generic.break1.00.816
Block placedBlocksWhen the block is placedblock.sculk_catalyst.placesubtitles.block.generic.place1.00.816
Block breakingBlocksWhile the block is in the process of being brokenblock.sculk_catalyst.hitsubtitles.block.generic.hit0.250.516
None[sound 1]BlocksFalling on the block with fall damageblock.sculk_catalyst.fallNone[sound 1]0.50.7516
FootstepsBlocksWalking on the blockblock.sculk_catalyst.stepsubtitles.block.generic.footsteps0.151.016
  1. a b 177082

Bedrock Edition:

SoundSourceDescriptionResource locationVolumePitch
BlocksOnce the block has brokenbreak.sculk_catalyst1.00.8-1.0
BlocksWhen the block is placedbreak.sculk_catalyst1.00.8-1.0
BlocksWhile the block is in the process of being brokenhit.sculk_catalyst0.30.5
Friendly CreaturesFalling on the block with fall damagestep.sculk_catalyst0.41.0
Friendly CreaturesWalking on the blockstep.sculk_catalyst0.171.0
Friendly CreaturesJumping from the blockstep.sculk_catalyst0.121.0
Friendly CreaturesFalling on the block without fall damagestep.sculk_catalyst0.141.0


Java Edition:

Bedrock Edition:

Data values


Java Edition:

NameIdentifierFormTranslation key
Sculk Catalystsculk_catalystBlock & Itemblock.minecraft.sculk_catalyst

Bedrock Edition:

NameIdentifierNumeric ID FormItem ID[i 1]Translation key
Sculk Catalystsculk_catalyst715Block & Giveable Item[i 2]Identical[i 3]
  1. ID of block's direct item form, which is used in savegame files and addons.
  2. Available with /give command.
  3. The block's direct item form has the same id with the block.

Block states

See also: Block state

Java Edition:

Name Default value Allowed values Description
Whether the sculk catalyst is actively spreading the sculk or not.

Bedrock Edition:

Name Default value Allowed values Description
Whether the sculk catalyst is actively spreading the sculk or not.

Block data

A sculk catalyst has a block entity associated with it that holds additional data about the block.

Java Edition:

  • Block entity data
    • Tags common to all block entities
    •  cursors: List of charges associated with the sculk catalyst.
      • : A charge.
        •  charge: How much power is in the charge.
        •  pos: List of three integers representing the coordinates of the charge.
        •  decay_delay: Does not relate to delay. Be 1 if the charge was spread from a sculk or sculk vein, 0 otherwise. The charge can spread to any block if this tag is 1. If it is 0, all the powers in the charge disappear when it spreads to a block not in sculk family.
        •  update_delay: Delay in ticks until the charge begins to travel after being created.
        •  facings: If the block to replace is an air or water, replace the block at its position with sculk vein, and store the facings of this sculk vein. If the charge is not at an air or water, or this tag is null, attempt to replace a block next to it with sculk vein. Can be any combination of north, south, east, west, up, down.

Bedrock Edition:

See Bedrock Edition level format/Block entity format.


Icon Advancement In-game description Parent Actual requirements (if different) Resource location
Advancement-fancy-raw.pngIt Spreads
Kill a mob near a Sculk Catalyst Monster HunterKill one of these 68 (70‌[upcoming: JE 1.20]) mobs near a sculk catalyst: Mobs that drop no experience are ignored for this advancement.adventure/kill_mob_near_sculk_catalyst


October 3, 2020Sculk Catalyst (pre-release).png Sculk catalysts are shown at Minecraft Live 2020.
November 13, 2020Sculk Catalyst BE1.png The sculk catalyst has a new texture in a tweet from Brandon Pearce.
April 26, 2021Kingbdogz states that sculk features aren't coming in 1.17.
October 16, 2021Sculk features were delayed to 1.19.
Sculk Catalyst Bloom BE1.gif New sculk catalyst functions were shown.
Java Edition
1.19Deep Dark Experimental Snapshot 1Sculk Catalyst BE1.png Sculk Catalyst Bloom BE1.gif Added sculk catalysts.
22w11aImplemented sculk catalysts into normal snapshot.
22w17aWardens now drop a single sculk catalyst upon death, making them renewable.
1.19.1Pre-release 6Sculk catalysts now drop five experience instead of 20.
Bedrock Edition
1.17.30beta"Sculk Catalyst" was mentioned in Bedrock Beta documentation.
beta Catalyst (top texture) BE1.png Sculk Catalyst (side texture) BE1.png Sculk Catalyst (bottom texture) BE1.png Sculk Catalyst (top bloom texture) BE1.png Sculk Catalyst (side bloom texture) BE1.png Sculk Catalyst textures were shown in internal Caves & Cliffs textures.
Vanilla Experiments
beta Catalyst BE1.png Sculk Catalyst Bloom BE1.gif Added sculk catalysts.
Wild Update
beta sculk catalysts to the "Wild Update" experimental toggle.
beta catalysts were updated to match Java Edition's behavior.
1.19.0beta catalysts are now available without enabling experimental gameplay.
beta now drop a single sculk catalyst upon death.
1.19.20beta catalysts now drop five experience instead of 20.


Issues relating to "Sculk Catalyst" are maintained on the bug tracker. Report issues there.