YouArch

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): Litematica did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager.

What it needs from Kiln

an access widener
Mixin
com.mojang.authlib.GameProfile
com.mojang.blaze3d.buffers.Std140Builder
com.mojang.blaze3d.buffers.Std140SizeCalculator
com.mojang.blaze3d.pipeline.RenderTarget
com.mojang.blaze3d.platform.NativeImage
com.mojang.blaze3d.systems.RenderSystem
com.mojang.blaze3d.systems.RenderSystem.AutoStorageIndexBuffer
com.mojang.blaze3d.systems.SamplerCache
com.mojang.blaze3d.vertex.BufferBuilder
com.mojang.blaze3d.vertex.ByteBufferBuilder
com.mojang.blaze3d.vertex.ByteBufferBuilder.Result
com.mojang.blaze3d.vertex.MeshData
com.mojang.blaze3d.vertex.MeshData.DrawState
com.mojang.blaze3d.vertex.MeshData.SortState
com.mojang.blaze3d.vertex.PoseStack
com.mojang.blaze3d.vertex.PoseStack.Pose
com.mojang.blaze3d.vertex.QuadInstance
com.mojang.blaze3d.vertex.VertexConsumer
com.mojang.blaze3d.vertex.VertexSorting
com.mojang.renderpearl.api.buffers.GpuBuffer
com.mojang.renderpearl.api.buffers.GpuBufferSlice
com.mojang.renderpearl.api.buffers.GpuBufferSlice.MappedView
com.mojang.renderpearl.api.commands.CommandEncoder
com.mojang.renderpearl.api.commands.RenderPass
com.mojang.renderpearl.api.commands.RenderPass.Draw
com.mojang.renderpearl.api.commands.RenderPass.UniformUploader
com.mojang.renderpearl.api.device.GpuDevice
com.mojang.renderpearl.api.pipeline.IndexType
com.mojang.renderpearl.api.pipeline.PrimitiveTopology
com.mojang.renderpearl.api.pipeline.RenderPipeline
com.mojang.renderpearl.api.pipeline.RenderPipeline.Snippet
com.mojang.renderpearl.api.textures.AddressMode
com.mojang.renderpearl.api.textures.FilterMode
com.mojang.renderpearl.api.textures.GpuSampler
com.mojang.renderpearl.api.textures.GpuTextureView
com.mojang.renderpearl.api.vertex.VertexFormat
io.netty.buffer.ByteBuf
io.netty.buffer.Unpooled
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
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

Litematica with certain features removed or modified.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file youarch-fabric-26.3-0.29.1.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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