Dimension Separator
by Layra_Alixis
Dimension Separator lets a modpack maker restrict which mobs, loot tables, world generation features and items are allowed in each dimension, configured through a simple JSON file.
What it does
Modpack makers and server owners use the mod to keep parts of a world out of certain dimensions. The author built it for a roleplay server where magic is forbidden in the Overworld for lore reasons, and where some structures still appeared there despite being meant for a custom dimension. Dimension Separator lets a server block mob spawning, loot tables, world generation, ores, plants, structures and item usage per dimension, and a JSON config states exactly which content should not appear in which dimension.
The config is still in testing, and the author notes that a setting in the file disables blocking for a whole category even when a namespace is listed. The mod is Forge only, published for 1.20.1 – 1.20.6, and runs on the server alone, so players join without installing it. Its code is open source under the MIT License, and public links exist for the source code and the issue tracker. Files were first published on 2026-04-09 and last updated on 2026-04-12, with 0.9.2 for 1.20.6 as the latest Forge file. It is one of 553 World generation mods with Forge files for 1.20.6.
Key features
Per-dimension blocking
Each category of content can be blocked in a chosen dimension, so a server keeps magic or structures out of a single world.
Mob spawn restriction
Mob spawning can be blocked in specific dimensions, without touching the spawns of other worlds on the same server.
Loot and structure control
Loot tables, chests, mob drops and structure generation are all covered by the blocking options in the config.
Simple JSON configuration
A JSON file lists the namespaces and categories to block for each dimension, with no code changes needed.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Lootify (Structures) is a Forge mod for 1.20.1 under All rights reserved, and it can be installed on the client, the server or both. Default Spawn Dimension is open source under the MIT License, runs on client and server, and is published for Fabric and Forge for 1.20.1, so it sets spawn rather than limiting content.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Dimension Separator | Forge | 1.20.1 – 1.20.6 | Server-side only | 2026-04-12 |
| Lootify (Structures) | Forge | 1.20.1 | Client or server, optional | 2025-11-16 |
| Default Spawn Dimension | Fabric and Forge | 1.20.1 | Client and server | 2026-04-18 |
Questions
Does Dimension Separator need to be installed on clients?
Which Minecraft versions does Dimension Separator support?
Is the JSON configuration final?
In the catalog
Dimension Separator is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 11,154 mods support Minecraft 1.20.6.
Similar mods
What the author says
I wanted to make a RP server where all the "magic" was forbiden in the overworld for lore purposes but I struggled to prevent some structures to appear in the overworld while still be in my custom dimension. So I tried to create a mod to help me just do that.
Official listing
- Modrinth page
- modrinth.com/mod/dimension-separator
- Owner
- Layra_Alixis
- Published
- 2026-04-09
- Updated on Modrinth
- 2026-04-12
- Facts verified
- 2026-10-15