Makes hostile mobs more threatening.
Rampant is a mod for BTA that changes hostile mob behavior and stats to make them more threatening.
Mod may not work properly with mods that modify base game hostile mobs.
What the mod changes (Spoilers Obviously):
All affected mobs can spawn most hostile mobs on their head.
Creepers
Skeletons
Spiders
Slimes
Zombies
Armored Zombies
Snowmen
Zombie Pigmen
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