Mutant Monsters

Evidence

Ran on Kiln's test stand (2026-11-04): MutantMonstersFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/commands/synchronization/ArgumentTypeInfo; MutantMonstersFabricClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/renderer/block/BuiltInBlockModels$ModelFactory.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.vertex.DefaultVertexFormat
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.math.Axis
• com.mojang.math.Transformation
• com.mojang.renderpearl.api.pipeline.BlendFactor
• com.mojang.renderpearl.api.pipeline.BlendFunction
• com.mojang.renderpearl.api.pipeline.ColorTargetState
• com.mojang.renderpearl.api.pipeline.DepthStencilState
• com.mojang.renderpearl.api.pipeline.PrimitiveTopology
• com.mojang.renderpearl.api.pipeline.RenderPipeline
• com.mojang.renderpearl.api.pipeline.RenderPipeline.Builder
• com.mojang.renderpearl.api.pipeline.RenderPipeline.Snippet
• net.minecraft.advancements.triggers.CriteriaTriggers
• net.minecraft.advancements.triggers.SummonedEntityTrigger
• net.minecraft.client.gui.components.AbstractWidget
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.input.KeyEvent
• net.minecraft.client.model.AdultAndBabyModelPair
• net.minecraft.client.model.BabyModelTransform
• net.minecraft.client.model.EntityModel
• net.minecraft.client.model.Model
• net.minecraft.client.model.geom.EntityModelSet
• net.minecraft.client.model.geom.ModelPart
• net.minecraft.client.model.geom.PartNames
• net.minecraft.client.model.geom.PartPose
• net.minecraft.client.model.geom.builders.CubeDeformation
• net.minecraft.client.model.geom.builders.CubeListBuilder
• net.minecraft.client.model.geom.builders.LayerDefinition
• net.minecraft.client.model.geom.builders.MeshDefinition
• net.minecraft.client.model.geom.builders.MeshTransformer
• net.minecraft.client.model.geom.builders.PartDefinition
• net.minecraft.client.model.monster.creeper.CreeperModel
• net.minecraft.client.model.monster.enderman.EndermanModel
• net.minecraft.client.model.object.skull.SkullModel
• net.minecraft.client.particle.ParticleProvider
• net.minecraft.client.particle.ParticleResources
• net.minecraft.client.particle.ParticleResources.SpriteParticleRegistration
• and 81 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

The mutants are back! Face scary creatures and powerful beasts like never before.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mutantmonsters-v26.3.1-mc26.3.x+fabric.jar. The scan reads the mod's classes; it does not run them.