Deep Overworld
by DingleTheRat
Deep Overworld adds a deep forest biome with a deepslate surface, along with Grasin blocks that inflict poisoning when placed in color combinations.
What it does
The mod generates a deep forest biome in the overworld whose surface is made of deepslate. Grasin blocks come in three variants, and placing a plain Grasin block beside a block of the matching color applies a poisoning effect. The Grasin B and Grasin C variants create piles that spread out or compact, and those piles generate deep forest terrain around them. Poisoning damage continues until it reaches a set level.
The mod needs Fabric API and TerraBlender to load. Weight settings make the deep forest spawn smaller, and decayed Grasin has an improved texture and a revised loot table. Both client and server need the mod, and it is released under All rights reserved, so the code is not open source. Files exist for 1.21, 1.21.1, 1.21.9 and 1.21.10 on Fabric and Quilt, with 1.1.0 for 1.21.10 as the latest file on both loaders.
Key features
Deep forest biome
A biome with a deepslate surface is added to the overworld, with its own terrain and vegetation.
Grasin poisoning effects
Combining Grasin with matching colored blocks gives poisoning effects of increasing strength, from the first to the third level.
Spreading and compact piles
Grasin B piles spread out over blocks and Grasin C piles compact, and both generate deep forest terrain.
Spawn weight control
A weight setting makes the deep forest spawn less often, which can be adjusted to suit a world.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Use cases
Who it’s for: Players who want a darker forest biome in the overworld, and server owners who want its poisoning hazards on a shared world.
How it compares
Deep Underground (Mining Dimension) is a Fabric mod for 1.21.1, released under the MIT License and open source, while Deep Overworld covers 1.21 – 1.21.10 and is not open source. forest+ adds forest content for 1.21.8 – 1.21.11 on Fabric and is under All rights reserved, so it is not open source either. The Blue Forest is a Fabric and NeoForge mod for 1.21.1 – 26.1.2 under CC0 1.0 Universal and not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Deep Overworld | Fabric and Quilt | 1.21 – 1.21.10 | Client and server | 2025-10-19 |
| Deep Underground (Mining Dimension) | Fabric | 1.21.1 | Client and server | 2026-03-25 |
| forest+ | Fabric | 1.21.8 – 1.21.11 | Client and server | 2025-12-14 |
| The Blue Forest | Fabric and NeoForge | 1.21.1 – 26.1.2 | Client and server | 2026-07-17 |
Questions
Does Deep Overworld need Fabric API?
Does Deep Overworld have to be installed on the server?
Which loaders does Deep Overworld support?
Does Deep Overworld have a poisoning effect that stacks?
In the catalog
Deep Overworld is one of 7,216 Magic mods on ModsFinder, and one of 3,630 Magic mods for Fabric. 15,569 mods support Minecraft 1.21.10.
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Official listing
- Modrinth page
- modrinth.com/mod/deep-overworld
- Owner
- DingleTheRat
- Published
- 2024-12-01
- Updated on Modrinth
- 2025-10-19
- Facts verified
- 2026-10-15