Random Mob Effects
by Serilum
Random Mob Effects gives each hostile mob a random potion effect when it joins a world, and the server decides which effects are possible and how strong they get.
What it does
Every hostile mob that loads into a world receives one randomly chosen modded potion effect. A few effects are disabled by default in the blacklist, and the list can be changed in the configuration file once it has been generated on first load. Effect duration can be set as high as the maximum Java integer value of 2147483647 ticks, roughly 30000 hours in-game, so an effect can outlast a session.
The mod is a configurable change that makes the game a little more difficult. Its settings include potionEffectLevel, with a minimum of 1, a maximum of 50 and a default of 1, which sets the level of the effects applied. hideEffectParticles, false by default, can hide the particles of mobs carrying an effect, and a particle effect can be disabled. Random Mob Effects requires Collective, and it runs on the server, so players join without installing anything.
Key features
Random hostile mob effects
Each hostile mob receives one random potion effect upon joining the world.
Effect blacklist
A few potion effects are disabled by default, and the blacklist can be edited in the configuration file.
Level and duration limits
The effect level ranges from 1 to 50, and duration can reach the maximum Java integer value in ticks.
Particle control
Particles from mobs carrying an effect can be hidden, and the particle effect can be disabled entirely.
Creeper exemption
Creepers are disabled by default, since they would create infinite lingering potion effects, which the author notes is probably what most players want.
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
Who it’s for: Server owners who want hostile mobs to carry unpredictable potion effects, and players of modded packs that already rely on Collective.
How it compares
Random Mob Drops is client and server, all rights reserved and not open source, with files for 1.20.4 – 26.1.2 on Fabric and Forge, so it changes drops instead of effects. PotionAbilities is client and server under the GNU Lesser General Public License v3.0 only, and is open source with files for 1.16.5 – 1.20.4 across all four loaders. Better Peaceful is server required with client optional, under the MIT License and not open source, covering 1.21 – 26.1.2.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Random Mob Effects | Fabric, Forge, NeoForge and Quilt | 1.16.5 – 26.3 | Server-side only | 2026-10-02 |
| Random Mob Drops | Fabric and Forge | 1.20.4 – 26.1.2 | Client and server | 2026-04-25 |
| PotionAbilities | Fabric, Forge, NeoForge and Quilt | 1.16.5 – 1.20.4 | Client and server | 2024-03-14 |
| Better Peaceful | Fabric, Forge, NeoForge and Quilt | 1.21 – 26.1.2 | Server required, client optional | 2026-06-14 |
Questions
Does Random Mob Effects need Collective?
Does a player need the mod installed to join a server running it?
Can the effects be made weaker or turned off?
In the catalog
Random Mob Effects is one of 7,216 Magic mods on ModsFinder, and one of 3,630 Magic mods for Fabric. 8,071 mods support Minecraft 26.3.
More from Serilum
Similar mods
What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/random-mob-effects
- Owner
- Serilum
- Published
- 2022-09-01
- Updated on Modrinth
- 2026-10-02
- Facts verified
- 2026-10-15