Legacy Fabric mods
10 mods match your filters.
BTW: The most infamous hardcore survival and tech mod in the history of the game
Adds completely client-sided pets to your game. Supports every vanilla mob, some custom ones, and will work on any server, including in singleplayer!
Nightmare Mode is an addon for Better Than Wolves CE 3.X that makes the mod a LOT harder, with focus on extreme difficulty, unforgiving mobs and reducing farming tedium. NM features new mobs, reworked mechanics and boss overhauls.
Mod add smart AI Femboy Boykisser Builder Entity for rd-132211, oldest minecraft version with custom settings and texture
A legacy fabric mod that uses the pathfinding throttling code from 1.9.4 to reduce lag caused by zombie pathfinding.
MobHunt: A Minecraft Fabric mod for Minecraft that forces you to kill a mob every X minutes or you die instantly. Perfect for hardcore worlds!
Makes food spoil. And definitely does not do a hundred other things as well.
A legacy fabric mod that allows baby zombies to drop xp and loot.
MITE port of the ToroHealth mod
Allows halloween mobs - mobs that wear jack o' lanterns or pumpkins - to spawn year round!