ModsFinder

PortalLightBlocker

by Renoceros

PortalLightBlocker stops Nether Portal blocks from emitting light, so the light level around a portal stays at 0.

FabricServer required, client optionalMIT LicenseOpen source1.21.1

What it does

On Fabric, the mod sets the light output of portal blocks from the vanilla value of 11 down to 0. Adjacent blocks then receive no light from the portal, which lets hostile mobs spawn next to portals where they could not before. Players who build high-efficiency portal farms no longer need the bug-based light suppression methods that were previously used to turn off the portal's light source.

The change is a single targeted code edit rather than an add-on that introduces new blocks, items or global rules, and the mod has one purpose. Server owners who need the End light farm effect can use it without relying on light suppression glitches. The author notes that the mod works with Vanilla Compatible setups.

PortalLightBlocker is published for Fabric only, with one release, 1.0.0 for 1.21.1, dated 2025-10-31. It is server required and client optional: the server must run it, while players may add it. The code is available as source under the MIT License, so it is open source.

Key features

  1. Nether Portal light level set to 0

    Nether Portal blocks emit no block light, instead of the vanilla light level of 11.

  2. Hostile mob spawning next to portals

    Mobs can spawn on blocks beside a portal once the portal stops adding light to them.

  3. Targeted code change

    The mod makes one narrow change to the portal block rather than adding new content.

  4. Single purpose

    The mod does one thing, which keeps its effect on a server predictable.

Compatibility

Latest build for each game version and loader.

1.21.11.0.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Portal farms

Portal farms that depend on mobs spawning next to a portal can be built without light suppression tricks.

End light farm effect

Server owners who want the End light farm effect can achieve it through the portal's light output.

Who it’s for: Server owners and builders who run Nether Portal based mob farms on Fabric for 1.21.1.

How it compares

Full comparison

Light Suppression Mod is a Fabric server mod for 26.2 under the CC0 1.0 Universal license, and it is open source. Colored Nether Portals is open source under the MIT License, runs on Fabric and NeoForge across 1.21 – 26.3, and needs the client and server. PortalLightBlocker differs by covering only the light output of the portal, for 1.21.1 on Fabric, where only the server must run it.

ModLoadersGame versionsEnvironmentUpdated
PortalLightBlockerFabric1.21.1Server required, client optional2025-10-31
Light Suppression ModFabric26.2Server required, client optional2026-08-17
Colored Nether PortalsFabric and NeoForge1.21 – 26.3Client and server2026-09-17

Questions

Does PortalLightBlocker need to be installed on the client?

Players may add it, but it works on the server alone, and neither side is required to run it on the client.

Which loader and version does PortalLightBlocker support?

It is published for Fabric only, and the single game version is 1.21.1.

Does the mod change how Nether Portals look?

The mod only changes the light output of portal blocks, from 11 to 0, and does not add new content.

What the author says

A simple Fabric mod for Minecraft 1.21.1+ that stops Nether Portals from emitting light. This mod has one single purpose: it sets the light emission level of Nether Portal blocks to 0.
Renoceros, on the Modrinth page

Official listing

Owner
Renoceros
Published
2025-10-31
Updated on Modrinth
2025-10-31
Facts verified
2026-10-15
Open on ModrinthCompare