Aggressive Mobs
by Zamecki
Aggressive Mobs makes most creatures hostile to players, including cows and pigs that would normally ignore them, on Fabric servers.
What it does
Normally hostile monsters already attack players on sight, but most creatures in vanilla Minecraft are passive. With this mod, those passive creatures join the fight as well, so a world that used to feel calm can become a much more dangerous place to explore. The effect is applied on the server, so players join without installing anything.
The behavior is controlled through game rules, which can be changed with the gamerule command. A main switch turns the whole effect on or off, while separate settings change how fast aggressive creatures move and how much damage they deal, both as percentages of normal values. Fabric API is required.
The mod is released under the CC0 1.0 Universal license, so it is open source. Version 1.1.0 is the latest Fabric file and targets 1.21.5 only, published on 2025-06-01 after a first release on 2025-05-17.
Key features
Universal aggression
Creatures that are normally passive are set to attack players, not only the monsters that already do.
Main switch
A single game rule turns the aggressive behavior on or off, so the mod can be paused without removal.
Speed and damage scaling
Separate percentage settings change how fast aggressive creatures move and how much damage they deal, with 100 as the default.
Game rule control
Every option is a game rule, so server owners can adjust behavior with the gamerule command at any time.
Compatibility
Latest build for each game version and loader.
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 and survival players who want a harsher world than vanilla, and map makers who need a tunable difficulty setting.
How it compares
Nightmare Mobs AI is a server-side Fabric mod for 1.21.1 under the MIT License, and it changes mob AI rather than making passive creatures hostile. BetterPhantoms is a server-side Fabric mod for 1.21.5 under All rights reserved, and it only changes phantoms. All Mobs Hostile is server-side only on Fabric for 26.1.2 under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Aggressive Mobs | Fabric | 1.21.5 | Server-side only | 2025-06-01 |
| Nightmare Mobs AI | Fabric | 1.21.1 | Server-side only | 2026-06-20 |
| BetterPhantoms | Fabric | 1.21.5 | Server-side only | 2025-04-25 |
| All Mobs Hostile | Fabric | 26.1.2 | Server-side only | 2026-06-15 |
Questions
Does Aggressive Mobs need Fabric API?
Do players need to install Aggressive Mobs?
Which Minecraft version does Aggressive Mobs support?
How can the aggression be turned off?
In the catalog
Aggressive Mobs is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 15,307 mods support Minecraft 1.21.5.
More from Zamecki
Similar mods
What the author says
This Fabric mod makes all creatures in Minecraft aggressive, including passive ones like cows and pigs. Be careful, the world has become a much more dangerous place! You can modify these game rules using the /gamerule command.
Official listing
- Modrinth page
- modrinth.com/mod/aggressive-mobs
- Owner
- Zamecki
- Published
- 2025-05-17
- Updated on Modrinth
- 2025-06-01
- Facts verified
- 2026-10-15