ChaosChunks
ChaosChunks is a NeoForge world generation mod that lets server owners control which biomes can appear and how the world is shaped.
What it does
Biome selection is driven by pools, so a server can build a whitelist or a blacklist of biomes for each dimension. Biome tags can be blacklisted as well. Region sizes can be tweaked, and the mod is configurable through the world creation screen, so the choices are made before a world is generated.
The mod is meant for worlds that should feel unpredictable, but it also adds limits. Restricting the biome list too far, such as allowing only minecraft:is_nether, can cause missing features and generation stalls, so the notes advise a broader list. Compatibility with dimension and biome mods is listed among its features. The jar name combines a major version with the Minecraft version, and the version number is independent until a major or minor change is made.
ChaosChunks runs on the server only. Players join without installing it. Files exist for NeoForge across 26.1 – 26.3, with 0.3.2-26.3 as the latest file for 26.3, published on 2026-10-01. The mod is released under a custom license that is not open source, and public links to the source code and a wiki are available.
Key features
Custom biome pools
Biome pools can be whitelisted or blacklisted per dimension, with biome tag blacklists supported.
Region size tuning
The size of generation regions can be adjusted to change how quickly biomes shift across the map.
Chaos-style generation
Biomes are chosen in a randomized pattern, so each chunk can differ from the ones around it.
World creation options
Settings are exposed in the world creation screen, so the biome setup is chosen before generation starts.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners running NeoForge who want to shape biome generation through pools, tags and region sizes. Players only need to join the server.
How it compares
Biome2 is a Forge and NeoForge mod for 1.20.1 – 1.21.4, under the Apache License 2.0, and it is server-side only. Less Predictable Cave Biomes covers Fabric, Forge, NeoForge and Quilt for 26.1.2 – 26.2 and needs the server while the client stays optional. Minecraft But Chunks are Random Biomes is a Fabric mod for 26.2 – 26.3 under the MIT License and runs on the server alone.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ChaosChunks | NeoForge | 26.1 – 26.3 | Server-side only | 2026-10-01 |
| Biome2 | Forge and NeoForge | 1.20.1 – 1.21.4 | Server-side only | 2025-04-29 |
| Less Predictable Cave Biomes | Fabric, Forge, NeoForge and Quilt | 26.1.2 – 26.2 | Server required, client optional | 2026-08-03 |
| Minecraft But Chunks are Random Biomes | Fabric | 26.2 – 26.3 | Server-side only | 2026-09-21 |
Questions
Does ChaosChunks need to be installed on the client?
Why can a narrow biome list cause generation stalls?
Which loaders does ChaosChunks support?
In the catalog
ChaosChunks is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 8,071 mods support Minecraft 26.3.
Similar mods
What the author says
There being so many numbers may confuse some users so here is a brief explanation. chaoschunks-\[major\_version\].H#.F#-\[minecraft\_version\].jar
Official listing
- Modrinth page
- modrinth.com/mod/chaoschunks
- Owner
- whotookDermitio
- Published
- 2026-05-03
- Updated on Modrinth
- 2026-10-01
- Facts verified
- 2026-10-15