Random Mob Effects
🎲 Randomly assign a (modded) potion effect to all hostile mobs in the world.
About this Mod
Random Mob Effects is a configurable mod created to make the game a little more difficult. Every hostile mob receives a random potion effect upon joining the world. There are a few potion effects disabled by default, but a blacklist is created on first load and you may change the values. The effect applied has a duration of the maximum integer value in java, which is 2147483647 ticks; around 30000 hours in-game. The particle effect can be disabled.
All available config options:
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potionEffectLevel default 1, min 1, max 50
The default level of the effects the mod applies, by default 1.
hideEffectParticles default false
When enabled, hides the particles from the mobs with an effect.
disableCreepers default true
Creepers can create infinite lingering potion effects which is probably not what you want. When enabled, the mod doesn't give creepers a random effect.
The default blacklist
is generated upon first load of the mod. It cycles through all potion effects within the Forge registry. This means that modded effects are supported, just make sure to refresh the config if a new mod with an effect is added. You can disable an effect by adding an exclamation mark (!) in front of the name.
The blacklist file is located in ./config/randommobeffects/ and is called blacklist.txt.
Hostile mobs with their random effects:
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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge or Modrinth ecosystem.
Serilum.com contains an overview and more information on all mods available.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!
Available Versions
How to Install Random Mob Effects 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 (26.1.2).
Install Mod
Open the mod browser in the dashboard and search for "Random Mob Effects". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1.2, 26.1.1, 26.1 (+24 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Random Mob Effects 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 (26.1.2). You can switch loaders with one click in the panel.
Is Random Mob Effects compatible with fabric and forge and neoforge and quilt?
Random Mob Effects officially supports fabric, forge, neoforge, quilt for Minecraft 26.1.2, 26.1.1, 26.1. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Random Mob Effects – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Random Mob Effects 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.
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