Baby Fat - Polymerized

Evidence

Ran on Kiln's test stand (2026-11-04): it stopped at eu.pb4.polymer.resourcepack.api.PolymerResourcePackUtils, a class from a jar nested inside the mod; Kiln does not unpack nested jars yet.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.biome.v1.BiomeModifications
• net.fabricmc.fabric.api.biome.v1.BiomeSelectionContext
• net.fabricmc.fabric.api.biome.v1.BiomeSelectors
• net.fabricmc.fabric.api.object.builder.v1.entity.FabricEntityType
• net.fabricmc.fabric.api.object.builder.v1.entity.FabricEntityType.Builder
• net.fabricmc.fabric.api.object.builder.v1.entity.FabricEntityType.Builder.Mob
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.core.component.DataComponents
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.nbt.CompoundTag
• net.minecraft.tags.BiomeTags
• net.minecraft.tags.BlockTags
• net.minecraft.util.Mth
• net.minecraft.world.damagesource.DamageSources
• net.minecraft.world.entity.Bucketable
• net.minecraft.world.entity.EntitySpawnReason
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.EntityType.Builder
• net.minecraft.world.entity.EntityType.EntityFactory
• net.minecraft.world.entity.Mob
• net.minecraft.world.entity.MobCategory
• net.minecraft.world.entity.MoverType
• net.minecraft.world.entity.SpawnPlacementTypes
• net.minecraft.world.entity.SpawnPlacements
• net.minecraft.world.entity.SpawnPlacements.SpawnPredicate
• net.minecraft.world.entity.WalkAnimationState
• net.minecraft.world.entity.ai.attributes.AttributeSupplier
• net.minecraft.world.entity.ai.attributes.AttributeSupplier.Builder
• net.minecraft.world.entity.ai.control.LookControl
• net.minecraft.world.entity.ai.control.SmoothSwimmingLookControl
• net.minecraft.world.entity.ai.control.SmoothSwimmingMoveControl
• net.minecraft.world.entity.ai.goal.Goal
• net.minecraft.world.entity.ai.goal.Goal.Flag
• net.minecraft.world.entity.ai.goal.GoalSelector
• net.minecraft.world.entity.ai.goal.PanicGoal
• net.minecraft.world.entity.ai.goal.RandomSwimmingGoal
• net.minecraft.world.entity.ai.goal.TemptGoal
• net.minecraft.world.entity.ai.navigation.PathNavigation
• net.minecraft.world.entity.ai.navigation.WaterBoundPathNavigation
• net.minecraft.world.entity.ai.targeting.TargetingConditions
• and 54 more

On the roadmap: Code next to data (0.3), Mixin (0.5)

In the author's words

Server-side polymer & fabric port of the Forge Mod: Baby Fat. No client-side mods required!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file babyfat-polymerized-1.0.14+26.3.jar. The scan reads the mod's classes; it does not run them.