Minecraft Java 1.21 Mods
Browse 10 free mods for Minecraft Java 1.21 — popular picks include EliteMobs, Invincible: Overdrive, All About Mobs - Creatures & Bosses & Combat.
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EliteMobs
Minidungeons, Arenas, Bosses, Custom Loot, Quests, MMORPG progression & more!
Invincible: Overdrive
A Modpack base on the comic and TV show "Invincible", focusing on the mod "Invincible Conquest", bringing in challenging adventure with difficult mobs and bosses to conquer
All About Mobs - Creatures & Bosses & Combat
All About Mobs enriches your Minecraft experience by adding a plethora of new creatures to discover and interact with, enhancing the dynamics of each biome.
Grace999
GracePlugin provides configurable, per-world grace periods with PvP and mob damage protection, boss bar countdowns, sound alerts, and customizable safe zone regions with flag-based protections.
[MobArena Addon] HavenArena - Extra Customizable Features
Add extra customizable features to your MobArenas, including new boss abilities and monster glow.
Basalt Arena
This mod adds 3 new bosses and a new structure to Minecraft.
JuggernautSMP
JuggernautSMP is a competitive PvP minigame plugin for Minecraft (Paper 1.21) where one player becomes an overpowered boss — the Juggernaut — and everyone else must team up to take them down.

ArenaWaves
Simple wave arena with bossbar progress and vanilla mobs.
Voidshard_abyss
The Voidshard abyss mod adds the voidshard abyss dimension, bosses and arena battles.
Twilight Tavern
Magical, cozy cottage? Or a dark wizard dungeon? Your choice! No futuristic automation mods. The modpack is a curated mix of magical, fantasy and farm related mods with challenging, dark outside world full of monsters and bosses.