DeepUnderWorld
by ChongYu668
DeepUnderWorld adds an Underworld dimension that replaces the vanilla Nether, with its own portal rules, rune stones and random teleport portals.
What it does
The mod adds a new dimension called Underworld and changes the way the Nether dimension works. The vanilla Nether Portal is disabled. To get into the Underworld, a player tunnels through two layers of bedrock below the Overworld, then builds a Nether Portal from obsidian and Mantle Block. Portals placed in the Overworld spawn point are only activated from the Overworld side.
Activation of a portal uses four rune stones, one at each corner. Random teleportation portals also appear, and each one must stand at least 5 blocks from any other portal, since closer placement can cause update-related problems. Ore generation, mob generation and spawner chest loot are all defined for the Underworld dimension, and a configuration file controls these settings.
Both Fabric and NeoForge builds are published, for game versions 26.2 and 26.3. A server running it needs every connecting player to have it too. The code is not open source; it is released under All rights reserved, and the author's public issue tracker is the place to report problems.
Key features
Underworld dimension
A new dimension that takes the place of the vanilla Nether as the destination beyond the Overworld.
Rune stone portal activation
A portal lights only after four different rune stones are placed at its four corners.
Random teleportation portals
Portals that send the player to a random location, placed at least 5 blocks apart from each other.
Shulker shell crafting
Shulker shells can be used in diamond equipment crafting recipes and appear in monster spawner chest loot.
Gallery
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
How it compares
Unstable Underworld also adds an Underworld, but it runs on Fabric, Forge, NeoForge and Quilt for 1.21.5 – 26.3 and is server required with an optional client side. More dimensions!!! is client and server on Fabric and NeoForge for 1.21.8 – 1.21.11 and is not open source. Dimension Spawn is server required on Fabric and NeoForge for 26.1 – 26.1.2 and is released under the MIT License, which is a different license from this mod's All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| DeepUnderWorld | Fabric and NeoForge | 26.2 – 26.3 | Client and server | 2026-10-06 |
| Unstable Underworld | Fabric, Forge, NeoForge and Quilt | 1.21.5 – 26.3 | Server required, client optional | 2026-09-26 |
| More dimensions!!! | Fabric and NeoForge | 1.21.8 – 1.21.11 | Client and server | 2026-03-08 |
| Dimension Spawn | Fabric and NeoForge | 26.1 – 26.1.2 | Server required, client optional | 2026-05-14 |
Questions
Which loaders does DeepUnderWorld support?
Do servers and players both need the mod?
How are portals to the Underworld built?
Where are the mod's settings kept?
In the catalog
DeepUnderWorld is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 8,071 mods support Minecraft 26.3.
More from ChongYu668
Similar mods
What the author says
1.A new dimension, the Underworld, has been added. 2.The original vanilla Nether Portal has been disabled.
Official listing
- Modrinth page
- modrinth.com/mod/deepunderworld
- Owner
- ChongYu668
- Published
- 2026-06-19
- Updated on Modrinth
- 2026-10-06
- Facts verified
- 2026-10-15