PortalLightBlocker
A simple Fabric mod for Minecraft 1.21.1+ that stops Nether Portals from emitting light.
About this Mod
PortalLightBlockerMod
Easy EOL (Null-Light Portals)
A simple Fabric mod for Minecraft 1.21.1+ that stops Nether Portals from emitting light.
📖 About
This mod has one single purpose: it sets the light emission level of Nether Portal blocks to 0.
The vanilla Nether Portal block emits a light level of 11. This prevents hostile mobs (which require block light 0) from spawning on adjacent blocks, forcing technical players to use complex, bug-based "light suppression" mechanics for high-efficiency portal farms.
This mod removes the need for those bugs by simply turning off the portal's light source, allowing mobs to spawn on adjacent blocks naturally (as long as skylight is also 0).
✨ Features
- Nether Portal Light Level: Changed from
11to0. - No Bugs/Exploits: Achieves the "End of Light" (EOL) farm effect using a clean, targeted code change instead of relying on light suppression glitches.
- Server-Side: This mod only needs to be installed on the server for its effect. Clients do not need it (though it is safe for them to have). Unless you're playing single player then you need it Client Side
- Vanilla Compatible: Does not add any new blocks, items, or global rules.
Available Versions
How to Install PortalLightBlocker on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).
Install Mod
Open the mod browser in the dashboard and search for "PortalLightBlocker". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
PortalLightBlocker server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.
Is PortalLightBlocker compatible with fabric?
PortalLightBlocker officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with PortalLightBlocker – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if PortalLightBlocker consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Rent Modded Server
Install PortalLightBlocker with just one click on your server.