Alpha Below
by multision
Under the modern Overworld, Alpha Below adds a buried dimension that reproduces the terrain and caves of early Alpha Minecraft.
What it does
The mod is a custom dimension placed beneath the Overworld. Its terrain follows old Alpha generation, with heavy fog, old cave shapes and a configurable option for Far Lands. Three main biomes cover the space, and blocks and items inside the dimension swap to Alpha-style textures.
Scattered landmarks such as brick pyramids, obsidian walls, monoliths, campsites and a dev house mark the dimension, along with floating chopped trees and rare player remains that suggest someone visited long ago. Access is meant to feel like breaking through rather than walking through a normal portal, and the mod can use Immersive Portals to stack the dimension physically beneath the Overworld.
Alpha Below runs on Fabric and Forge for 1.20.1 and is a client and server mod, so players and the server both need it. It is released under All rights reserved and is not open source. Architectury API and Cloth Config API are required, and Mod Menu and Cloth Config integration are included. Files were published on 2026-03-10 and last updated on 2026-07-10.
Key features
Buried Alpha dimension
A custom dimension lies beneath the Overworld, reproducing the terrain of early Alpha versions.
Three Alpha biomes
Alpha Forest, Alpha Desert and Alpha Snowy make up the main biomes of the dimension.
Landmarks and remains
Brick pyramids, obsidian walls, monoliths, campsites and rare player remains are placed through the world.
Lost Voyager presence
A quiet ambient figure, based on early sightings of the Herobrine legend, appears through distant figures, shrines and subtle world events.
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
Optional 1
Use cases
Who it’s for: Players who prefer atmosphere and exploration over combat, and server owners who want a quiet buried world for their players to find.
How it compares
Alpha Void is Forge-only for 1.20.1, client and server, under the GNU General Public License v3.0 or later, and is not open source. Alpha Dimension is also Forge-only for 1.20.1, client and server, but is licensed under the GNU Affero General Public License v3.0 only and is not open source. Left Forgotten covers Fabric, Forge and NeoForge 1.20.1 – 1.21.1, under All rights reserved, which makes it the one option here that spans more loaders and newer versions.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Alpha Below | Fabric and Forge | 1.20.1 | Client and server | 2026-07-10 |
| Alpha Void | Forge | 1.20.1 | Client and server | 2026-04-02 |
| Alpha Dimension | Forge | 1.20.1 | Client and server | 2026-09-26 |
| Left Forgotten | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-07-01 |
Questions
Does Alpha Below need Architectury API?
Must the server have Alpha Below installed?
Which loaders does Alpha Below support?
In the catalog
Alpha Below is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 34,764 mods support Minecraft 1.20.1.
More from multision
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What the author says
What if the old Minecraft world never really disappeared? Alpha Below is a Fabric and Forge mod for Minecraft 1.20.1 that adds a buried Alpha-style world beneath the modern Overworld. It’s dark, silent, empty, and frozen in time — not because it’s trying to be cheap horror, but because it feels like a place everyone…
Official listing
- Modrinth page
- modrinth.com/mod/alpha-below
- Owner
- multision
- Published
- 2026-03-10
- Updated on Modrinth
- 2026-07-10
- Facts verified
- 2026-10-15