Nether Portal Spread
by Serilum
Around a nether portal, the nether spreads into the overworld over time, unless a set number of coal blocks is placed nearby, in Nether Portal Spread.
What it does
Once a portal exists, nether blocks begin to spread into the overworld around it, within a radius that is set in the config and defaults to 15 blocks. By default placing four coal blocks inside that radius halts the spread. Players near the portal receive a message when the spread starts and another when it is stopped.
Each portal is saved in a data folder inside the world. A portal is picked up when it is created or when a player travels from the nether to the overworld, so older worlds need one trip through the portal to start the effect. Version 4.4 and above works with Immersive Portals. Nether Portal Spread requires Collective. It runs on the server alone, so players join without installing anything, and the mod is published for 1.16.5 – 26.3 across Fabric, Forge, NeoForge and Quilt, under All rights reserved.
Key features
Configurable spread radius
The area the nether can reach from a portal ranges from 1 to 100 blocks and defaults to 15.
Coal blocks stop the spread
The number of coal blocks needed inside the radius to prevent spreading can be changed in the config.
Player messages
Messages can be turned on or off for portal creation, blocks found and portal breaking, and their text can be edited.
Adjustable spread speed
The delay between spread steps and the number of blocks converted instantly can both be set.
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
1.19.x3 of 3 versions with builds
1.18.x1 of 1 version with builds
1.16.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Corrupted hub worlds
A server owner can use the spread as a timed threat around portals in a shared world, with players deciding when to block it.
Who it’s for: Server owners who want portals in their world to carry a lasting consequence, and adventure map makers who build storylines around corrupted areas.
How it compares
No Nether Portal is a Forge mod for 1.18.2 – 1.20.1 that needs both client and server and is not open source. Regions Unexplored is open source under the MIT License and covers Fabric, Forge, NeoForge and Quilt for 1.18.2 – 26.1.2, and it is client and server as well. Nether Portal Spread runs on the server alone, so no player needs to install it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Nether Portal Spread | Fabric, Forge, NeoForge and Quilt | 1.16.5 – 26.3 | Server-side only | 2026-10-02 |
| No Nether Portal | Forge | 1.18.2 – 1.20.1 | Client and server | 2023-10-07 |
| Regions Unexplored | Fabric, Forge, NeoForge and Quilt | 1.18.2 – 26.1.2 | Client and server | 2026-08-06 |
Questions
Does Nether Portal Spread need Collective?
Do players need to install Nether Portal Spread?
How does an existing portal start spreading in an older world?
In the catalog
Nether Portal Spread 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 Serilum
Similar mods
What the author says
Nether portals spread (nether) blocks to the overworld around the portal in a configurable radius. By default you can stop the spread by placing four coal blocks within the portal's radius. This can however be changed in the config. Players around the portal will receive a message when the spread effect begins and…
Official listing
- Modrinth page
- modrinth.com/mod/nether-portal-spread
- Owner
- Serilum
- Published
- 2022-09-01
- Updated on Modrinth
- 2026-10-02
- Facts verified
- 2026-10-15