IncreaseSlimeRates
by nouxinf
IncreaseSlimeRates changes how often slimes spawn in swamps and mangrove swamps, and it does so through a datapack override that works in slime chunks as well.
What it does
Slimes spawn 2.5 times as often in swamps and mangrove swamps. The change is applied by a datapack override of the worldgen data for those biomes, so it takes effect in new terrain and does not depend on a mod-specific spawning system. Installation is handled through the Fabric or NeoForge build, and the datapack can also be loaded on its own on a server.
A server owner installs the mod or datapack, and players can join without it: only the server needs it for the spawn change to apply. The mod is released under CC0 1.0 Universal and is not open source. Files exist for four game versions, 1.21.11 – 26.1.2, with 1.0 for 26.1.2 as the latest build on both Fabric and NeoForge.
Key features
Higher swamp slime spawns
Slime spawn rates in swamps and mangrove swamps are raised to 2.5 times the vanilla level.
Datapack-based override
The change works by overriding worldgen data, so it needs no custom code and can be loaded as a datapack.
Slime chunk limitation
Spawning in slime chunks is not changed by this mod, and the author notes the limitation.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Biome Vote Swamp covers a different part of the swamp biome and is released under Apache License 2.0 for 1.20.5 – 1.21.8, while IncreaseSlimeRates targets slime spawns on the 1.21.11 – 26.1.2 range. Mangrove Manor is server required and client optional for 1.21.9 – 26.3, and it is not a spawn-rate change.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| IncreaseSlimeRates | Fabric and NeoForge | 1.21.11 – 26.1.2 | Server required, client optional | 2026-05-18 |
| Biome Vote Swamp | Fabric, Forge, NeoForge and Quilt | 1.20.5 – 1.21.8 | Server required, client optional | 2025-09-07 |
| Mangrove Manor | Fabric, Forge, NeoForge and Quilt | 1.21.9 – 26.3 | Server required, client optional | 2026-09-20 |
Questions
Does IncreaseSlimeRates need to be installed on the client?
In the catalog
IncreaseSlimeRates is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 15,189 mods support Minecraft 26.1.2.
More from nouxinf
Similar mods
What the author says
This datapack makes slimes spawn 2.5 times more often in swamps and mangrove swamps. It is not able to change the spawning rates of slimes in slime chunks unfortunately. Note that because the datapack has to fully override worldgen info for swamps and mangrove swamps, it's best to update the datapack
Official listing
- Modrinth page
- modrinth.com/mod/increaseslimerates
- Owner
- nouxinf
- Published
- 2026-04-29
- Updated on Modrinth
- 2026-05-18
- Facts verified
- 2026-10-15