Mutator

Attribute randomizer based on logical scaling

by nnhomoliAdventure Game mechanics Mobs

Fabric

Loaders: Fabric
Downloads on Modrinth: 457
Followers on Modrinth: 1
versions: 9
Updated: October 20, 2026Oct 20
Published: in 2025

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— fish · swipe

At a glance

Runs on Fabric

For Minecraft 1.21.10–26.3

Server only — players don't need to install it

Latest version — 3.1 from October 20, 2026

Requires Fabric API and AbstractedUtilities

License MIT — free

Where it's needed

In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.21.10–26.3

Mutator

Attribute randomizer based on logical scaling

GameRules

GameRule	Type	Default	Explanation
attribute_inheritance	Boolean	True	On animal breeding, the baby has a chance to inherit attributes from parents
attribute_infection	Boolean	True	On zombie infection, the infected has chance to inherit a random attribute from zombie
attribute_preservation	Boolean	True	Preserves attributes on conversion
skeletons_use_axe	Boolean	True	Makes skeletons with scale > 1.2 have axe instead of a bow
explosion_scaling	Boolean	True	Scales ExplosionRadius of mobs
burn_scaling	Boolean	True	Scales burn damage
tame_scaling	Boolean	True	Makes animals harder to tame
range_scaling	Boolean	True	Scales mob attack/pickup range
exp_scaling	Boolean	True	Scales experience
mutation	Boolean	True	If mobs should have mutation
scaling_steps	Integer	4	How many steps, maximum, per mutated mob spawn, should be taken in order to find a free space. Higher values will result in better accuracy at the cost of main thread performance.
chance	Integer	25	Mob mutation chance
weirdness	Double	6.0	General weirdness that is used for random
attribute_positive_multiplier	Double	1.2	General scaling for positive attributes
attribute_negative_multiplier	Double	0.5	General scaling for negative attributes

External configurations

ignore.json

Field	Type	Explanation
reasons	List	SpawnReason values that mutation ignores
attributes	List	Attribute identifiers that mutation ignores
types	List	EntityType identifiers that ignore mutation
conversion	List	EntityType identifiers that ignore attribute_preservation

scaling.json

Field	Type	Explanation
positive	List	Attributes that increase with bigger mob scale
negative	List	Attributes that decrease with bigger mob scale
lootScaling	Boolean	Enables/disables loot scaling; needs restart to take effect

most config changes can be applied at runtime with /mutator::reload

FAQ

How to install Mutator?

Install Fabric for your Minecraft version, download Mutator for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Mutator support?

Mutator has builds for Minecraft 1.21.10–26.3.

Is Mutator needed on the server?

Server only — players don't need to install it

License and source

MIT Licensefree to use and share with credit to the author

Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders