Minecraft Java 1.21 Mods
Browse 261 free mods for Minecraft Java 1.21 — popular picks include Pirate Adventures, Mystborn Horizons, Minecolonies - Order and Chaos.
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Pirate Adventures
Pirates is a huge project for the Minecraft game in the form of a DataPack. By installing the required ResourcePack and the DataPack itself, you get a large number of new mobs, items, blocks, mechanics, and bosses.
Mystborn Horizons
A progression mod to add more ores, mobs, bosses and structures.
Minecolonies - Order and Chaos
This is the official modpack from the youtube serie "Minecolonies Caos e Ordem". Create your own colonie in a dangerous world with buffed monsters and bosses.
Project Conquest
A action pack rpg game with multi player and over 3 new worlds plus space based on a show called invincible with many powers and bosses plus npcs where you have to destroy worlds or bring peace and fight many foes and complete the story line
Daily Boss x Brutal Bosses
Compatibility between Daily Boss and Brutal Bosses.

Warden bossfight
Turns a player into a boss with warden and sculk-based abilities
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.
epic fight, cataclysm,bosse's rise, born in chaos, hazennstuff, cataclysmspellbook compatibility datapack
A datapack that make epicfight compatible with hazen N stuff, bosse's rise, iron spell and spellbook, and born in chaos for minecraft neoforge 1.21.1
Diary of an 8-Bit Warrior
Experience Aetheria like a Terrarian! Complete quests, kill bosses, and level up your skills! Maybe you'll even meet Runt and his friends…
Catch, Create, Conquer
The Ultimate Cobblemon RPG! Gyms 1-8, 20+ Bosses, All Megas from Z-A, 1000+ Quests, and Gambling!!
Arcadia Unlimited
Step into the worlds of Arcadia, start simply but slowly evolve to use kinetic technology and eventually complex machines. Explore the world, complete various quests, and defeat challenging bosses with your learned skills and magic.
DragonForge
Dragon Forge is a RPG–survival with skill-gated gear, Create-powered industry, mythic bosses & dungeons, and lush worldgen. 200+ content mods + 90+ perf/QoL. Built for multiplayer on MysticHorizonsMC.
Kurts FEN Community Pack
A modpack built for my Community and everyone else that enjoys a Tech and Magic heavy world filled with Dungeons and Bosses that need to be slain.

Undermagic II
Progression expansion featuring flashy weapons, structures, and a challenging boss fight
DeadSummons
This adds Magic of evil. We have three magic types, one boss. and items for your world!
PixelColonies: Arcane Journeys
Dimension and Exploration Modpack with very hard Bosses and other Creatures, as well as many diffrent dimensions and Quests
Eclipse Of Arcanum
you are in a new world, you only have your imagination, the goal is to defeat all the bosses
Castle and Farm
Farm and bossfight
Fortnite 3: Victory Royale
Featuring GUNS, BOSSES, OP WEAPONS & ARMOR, MAGICAL CROPS, INSANE TECH this pack is loaded with crazy mods that'll throw you on a wild ride
Theosis
Plugin-ready RPG survival with loot, gems, bosses & biomes. Thesis-style modularity. Multilanguage Apotheosis-inspired
Iron Islands
Adds 6 different dimensions and 4 bosses.
Temples & Templates
Adding more boss encounters and tools to spice up your minecraft playthroughs!
CrisisCraft
This mod pack features Magic, Battles, Bosses, and a new immersive gameplay experience.
SC Final Adventure
Challenge countless bosses while grinding for god-like gear and dive into brutal endgame gateway bossrush
Cobblemon Dark
A Cobblemon modpack, featuring Create, Create Aeronautics, exploration, trainers, bosses and more.
tensura mahou tsukai damage compatibility
just make mahou tsukai attack works on tensura boss
Endshards
A Minecraft Mod expanding the endgame with 3 new armor sets, a new dimension, and a new boss!
Prism Drift
Balanced without magic and guns, adventure filled with loads of dimensions and various bosses
Tensura Abyssal Reincarnation
Tensura Abyssal Reincarnation is a dark, cozy SMP modpack blending magic, exploration, and survival. Master spells, automate with Create, and face deadly bosses in a semi-anarchy world where freedom rules and every choice shapes your path.
Vanilla Over The Top
This project adds multiple vanilla+ mods which add: An expansion to illagers, a much bigger and taller nether with new structures and bosses, a new way to get to the end, along with the end being reworked and also minecraft dungeons styled enchanting.
CrazyMC - A Special Apocalypse | Apocalypse with Quests!
A chaotic Minecraft adventure featuring zombie hordes, powerful bosses, firearms, magic, advanced technology, massive dungeons, and endless progression.
Lava Chicken Boss
Adds a new boss and an exciting battle with him, as well as his minions and some items.
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.
Elexir [CSD]
Step into ELEXIR - This modpack is magic, automation and adventure. Here you can explore the world as well as magic or mechanisms to make life easier. Ancient artifacts, bosses other worlds are created for gameplay variety
Summoner Mod
A mod that adds 4 bosses and 4 structures. Almost no dependencies!