Mobs Mods for Minecraft Java
Browse 6 free Mobs mods for Minecraft Java — popular picks include Schools of Magic Mod, Iron's Spells 'n Spellbooks:Monsters & Spellbooks, ARC Rooms (The Classrooms).
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Schools of Magic Mod
Adds various magic constructs including wands, better cauldrons, new biomes and structures, and a new boss monster.
Iron's Spells 'n Spellbooks:Monsters & Spellbooks
A medium sized addon for the popular mod Iron’s Spells ‘n Spellbooks that brings a 100+ spells,2 new spell schools and a ton of new gear and uniqye spell casting enemies

ARC Rooms (The Classrooms)
This mod adds some contents like items, monsters, structures from "The Classrooms"
Comprogrammer Programmer Art Mod Compat Compliation Resource Pack (1.21.1, 1.20.1)
Comprogrammer Programmer Art Mod Compat Compliation Resource Pack transforms the look of over 180 popular mods to match the classic, old-school Minecraft art style. It replaces modern textures with the familiar, blocky designs from older versions of the game. This pack brings a sense of nostalgia to your modded worlds, making brand-new biomes, creatures, and […]
Realm RPG: Imps & Demons
Adds old-school fantasy demonic beings in the Nether. Vanilla style.
FilthScape
A modpack inspired by RuneScape and old school RPGs. Features: balanced skill based leveling, tons of creatures to fight and tame, and a fresh world to adventure through!