Crystal Optimizer

Evidence

Ran on Kiln's test stand (2026-11-04): CrystalOptimizerSyncClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/networking/v1/PayloadTypeRegistry.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
• net.minecraft.world.attribute.EnvironmentAttributeSystem
• net.minecraft.world.attribute.EnvironmentAttributes
• net.minecraft.world.entity.Entity.RemovalReason
• net.minecraft.world.entity.boss.enderdragon.EndCrystal
• net.minecraft.world.level.block.RespawnAnchorBlock
• ClientLevel.addEntity()
• ClientLevel.removeEntity()
• ItemStack.is()
• Items.GLOWSTONE
• Level.environmentAttributes()

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

Instant crystals and anchors with zero server delay — a lightweight, client-side mod that makes Crystal & Anchor PvP feel smooth and responsive. 100% legit, no cheat, anti-cheat safe.

Scan

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