About Nether Portal Spread
From Modrinth🔮 Spreads (nether) blocks to the overworld around nether portals in a configurable radius.
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 when it is prevented.
The mod saves all portal locations to '../world-folder/data/netherportalspread/portals/'. A new portal is detected when it's created or when a player goes from the nether to the overworld. So for old worlds you'll have to go through it and back once to start the spread effect, or re-fire the portal. This makes it a lot more efficient than checking every block in the world for a portal.
Version 4.4 and above is compatible with the Immersive Portals mod.
All available config options:
Show Spoiler
sendMessageOnPortalCreation default true
When enabled, sends a message to players around the portal that the nether is spreading and that you can stop the spread with 'preventSpreadBlockAmountNeeded' of the 'preventSpreadBlockString' block.
messageOnPortalCreation default "You feel a corrupt energy coming from the portal. The nether will slowly spread into the overworld unless %preventSpreadBlockAmountNeeded% %preventSpreadBlockString% are placed within a %portalSpreadRadius% block radius around the portal."
The message sent on portal creation.
sendMessageOnPreventSpreadBlocksFound default true
When enabled, sends a message to players around the portal that the nether spread has stopped when the portal detects new 'preventSpreadBlockString' blocks.
messageOnPreventSpreadBlocksFound default "With enough %preventSpreadBlockString% placed, you feel the corrupted energy fade."
The message sent on preventspread blocks found.
sendMessageOnPortalBroken default true
When enabled, sends a message to players when a portal is broken.
messageOnPortalBroken default "With the nether portal broken, the corrupted energy is no longer able to enter the overworld."
The message sent when a portal is broken.
prefixPortalCoordsInMessage default true
When enabled, shows the portal coordinates in portal messages.
portalSpreadRadius default 15, min 1, max 100
The radius around the portal to which the nether blocks can spread.
spreadDelayTicks default 40, min 1, max 72000
The delay in ticks in between the spread around the nether portal. 20 ticks = 1 second.
instantConvertAmount default 50, min 0, max 1000
The amount of blocks that are instantly converted to a nether block around a portal when it is detected. If there are existing nether blocks within the radius, their count is subtracted from this number.
Highlights
From source dataGame versions
Supports 29 Minecraft versions, the newest being 26.3.
Loaders
Runs on Fabric, Forge, NeoForge and Quilt.
Footprint
Rated a light load on a server.
What kind of mod it is
From the catalogBuilding & decoration
Blocks, furniture, decorations and building tools.
Runs on your server
From source side supportModrinth lists Nether Portal Spread as required on the server. Check its Modrinth page to see whether players need it too.
Compatibility
- Game
- Minecraft
- Loaders
- FabricForgeNeoForgeQuilt
- Runs on
- Serverrequired on the server
- Game versions
- 26.3 and 28 earlier
Verified at the source
- ✓ModrinthOfficial listing, checked 2026-10-01Open ↗
- ✓AuthorSerilum, as published on Modrinth
- ✓LicenseLicenseRef-All-Rights-ReservedFree
