ModsFinder

Slime chunk: Spawn-Proof

by CSQRB

Slime Chunk: Spawn-Proof lets server owners stop slimes from spawning in slime chunks by controlling light levels there.

NeoForgeServer-side onlyMIT LicenseOpen source1.21.1

What it does

Slimes normally spawn in slime chunks regardless of conditions. This NeoForge mod changes that behavior so that light can be used to keep slimes from appearing in a chosen area, making a spawn-proof zone possible. Only slime chunks are affected, and the surface swamp biome keeps its normal slime spawning. It runs on the server alone, so players need nothing extra to join. Files are published for NeoForge 1.21.1, and the code is released under the MIT License, making it open source.

Key features

  1. Light-based spawn control

    Light levels in a slime chunk determine whether slimes will spawn there, so an area can be made spawn-proof.

  2. Limited to slime chunks

    The changes apply only inside slime chunks, leaving other spawning rules untouched.

  3. Swamp biome unaffected

    Slimes still spawn in the surface swamp biome as usual.

Compatibility

Latest build for each game version and loader.

1.21.11.0.2
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Slime Chunk No More is a Fabric option for 1.21.5 – 1.21.11 that is server-side only and released under CC0 1.0 Universal. Slime Tweaker is a NeoForge mod for 1.21 – 1.21.1 that is also server-side only and open source under the MIT License.

ModLoadersGame versionsEnvironmentUpdated
Slime chunk: Spawn-ProofNeoForge1.21.1Server-side only2026-08-18
Slime Chunk No MoreFabric1.21.5 – 1.21.11Server-side only2025-06-18
Slime TweakerNeoForge1.21 – 1.21.1Server-side only2024-11-10

Questions

Does Slime Chunk: Spawn-Proof need to be installed on clients?

No. Server owners install it, and players connect with no copy of their own.

In the catalog

Slime chunk: Spawn-Proof is one of 11,058 Mobs mods on ModsFinder, and one of 4,974 Mobs mods for NeoForge. 32,366 mods support Minecraft 1.21.1.

Mobs mods11,058NeoForge modsMods for 1.21.132,366

More from CSQRB

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What the author says

This mod changes it. Now slimes won't spawn if there's light, making it possible to spawn-proof area from them. These changes only applied to slime chunks. Slimes that spawn on surface in a swamp biome are unaffected
CSQRB, on the Modrinth page

Official listing

Owner
CSQRB
Published
2026-08-17
Updated on Modrinth
2026-08-18
Facts verified
2026-10-15

Tags

Game mechanicsMobs
Open on ModrinthCompare