Minecraft Java 1.21 Mods
Browse 519 free mods for Minecraft Java 1.21 — popular picks include Limitbreak, Monsters Unlimited, Daily Boss - More Config.
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Limitbreak
Minecraft transformed into a roguelite wave-survival RPG with classes, relics, bosses, and permanent progression.
Monsters Unlimited
A challenging Minecraft mod featuring boss monsters! Starting from day ten, a powerful boss monster will appear in your world every five days.
Daily Boss - More Config
Add more config for Daily Boss
The Epic Player Boss
Adds a new player like NPC boss which will give you an epic boss fight.
Summoner Mod
A mod that adds 4 bosses and 4 structures. Almost no dependencies!
Ranold's Boss Music (Datapack)
This is a work in progress resourcepack/datapack that adds boss music to bosses in minecraft!
Kings & Monsters
An adventure and progression mod featuring the Ogre Tribe, guarded outposts, escalating patrols, powerful relics, a massive fort, and a multi-stage boss fight.
Lava Chicken Boss
Adds a new boss and an exciting battle with him, as well as his minions and some items.
Headaches!
Headaches! is a Minecraft mod that adds new structures inhabited by the most absurd and unconventional mini-bosses—all characterized by having disproportionately large heads. Discover a challenging new adventure!
Nightlancer
Adds an ominous boss on horseback
Electric Boogaloo
Adds a new zombie dancing boss, Electric Boogaloo with his iconic Backup Dancers from the Plants Versus Zombies Games
SC Final Adventure - Machines
Hunt bosses, farm their essence through Easy Mob Farm and Create New Age, and craft your way to the End in a guided 1.21.1 factory-and-adventure pack.
koper_mod
A chaotic Minecraft mod with unique bosses, broken armor sets, and a corrupted dimension a little unbalanced but fun as hell.
Ominous Wither
Adds a thrilling boss fight experience, summoned by building the Wither with Bad Omen.
Summonable Steve
A summonable Steve boss with complex AI and behaviors
oCode-AnarchiaBosses
Create custom bosses with skills, attributes, equipment and more!
Norious
Bored of not Having enough strong bosses to fight? Ever Wanted To become a God and fight Demons In Minecraft? This is the mod for you.
Cobblemon Boss Bars
Pokémon inspired boss bars!
The Angry Ghast
Three new Ghast themed bosses, one for each dimension
Minecraft... But Enhanced!
A Vanilla+ Modpack with immersive gameplay, Reworked Mobs and Difficulty, More Structures, Reworked Bosses, More Music, and More!
ZApocalypse
ZApocalypse is a Fabric mod for 1.21.1 that turns every night into a zombie wave, with elite variants, blood nights, and a Zombie Lord boss. As the apocalypse escalates, zombies evolve unique abilities while other hostile mobs retreat deep below Y=25.
Dangerous Nights
Every night without sleep makes the world more dangerous. Survive growing monster hordes, defeat minibosses, and earn stronger rewards as your streak rises.
Fortune Craft Modpack
The Official Modpack for the FortuneCraft Modded Server. Explore Minecraft in a new light with a heavy focus on Create, with the addition of new Biomes, Blocks, Mobs and Bosses!
Basalt Arena
This mod adds 3 new bosses and a new structure to Minecraft.
Unknown Echoes
adventure Mod centered around exploration, puzzle-solving, boss battles, and progressive ability growth.
Void king dimension
Adds an epic boss fight with the Void King and his minions, spreading corruption, and powerful weapons.
Daily Boss x Cobblemon
DBxCobblemon is a compatibility bridge provided to integrate [DailyBoss] with [Cobblemon]

Techless
A Mod that adds 3 new bosses with unique phases Fight them to craft Legendary weapons in this Vanilla+ progression mod Made using Mcreator
Document 17
Document 17 is a mod that adds in; 30+ characters (armors) two double chest's worth of items, a whole assortment of bosses to fight. and new- interesting ways to play the game. along with several base superpowers for players to use. want superheros? here.
Pandemonium Bosses
This data pack adds new fun bosses to fight
KolegxixPL Magic RPG
dive into this mysterious world with new creatures spells bosses and quests
Bosses And Mobs
Adds More Bosses To Minecraft,More Tools And Armor To Minecraft again...
The Mob
Mob Framework | YAML | Boss Phases | Radar HUD | AutoSpawn | Player Stats | 1.21.+
TCC - Skyzone
An expert-mode 1.21.1 NeoForge skyblock pack with tech, automation, and magic (Mekanism, Create, Oritech, Ars Nouveau), exploration dimensions, and scaled-up Apotheosis difficulty for tougher mobs and bosses.
Grandia Dungeons
A dark fantasy roguelike dungeon adventure with classes, bosses, cursed loot, magic, traders and procedural floors.
Bosses and things
In this mod I added 3 new bosses and special items with them.