Minecraft Java 1.21 Mods
Browse 1,188 free mods for Minecraft Java 1.21 — popular picks include Kurts FEN Community Pack, Styled Boss Bar API, xBossBar.
Updated daily
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.
Styled Boss Bar API
Design your Styled Boss Bar!
xBossBar
Create, edit and show custom BossBars with a few commands, All on a single plugin.
Boss Rifts — Compat+ [Configuration Datapack]
Configure what bosses you choose to not generate rifts upon being killed.
Winter Drop Ruined
Adds the Krakentilus boss, 2 new Nautilus variants, and some spear related content
✨ STORMBOSSY
Zaawansowany kreator własnych bossów
EzCountdown
Run flash sales, timed events, and launches with stunning countdowns - ActionBar, BossBar, Titles & Placeholders!
Colossus Boss
Giant boss formed from the environment and attacking and hurling chunks of environment at you!

Undermagic II
Progression expansion featuring flashy weapons, structures, and a challenging boss fight
Dungeonia - The rpg modpack exploration withe dungon perspective
explore Dungeonia: an immersive RPG modpack Experience hardcore 3rd person combat with barebones outline style. Master skills and gear while looting dungeons, dungon crawls, and epic bosses in this massive 3rd-person perspective fantasy adventure

Vital
A mod which adds clean, minimal, but readable SHADER COMPATIBLE health bars to each mob in the game (optionally replacing boss bars with colour coded bars per active boss too).
DeadSummons
This adds Magic of evil. We have three magic types, one boss. and items for your world!
Boss Crosshair-10 (face)
Crosshair with another Shape and with Shading
THE SKELETON BOSSES | CUSTOM MOBS [1.20 - 1.21.1]
Incorporate custom bosses with custom rewards, create a new boss dynamic
OHPS10 Boss
Adds the boss "Obama Harry Potter Sonic 10"
The Ice Warrior
datapack that add an ice theme mid-game boss
Bosscraft 2: Remake
Bosscraft 2: Remake is an unofficial project inspired by Sthullen's famous mod for older and outdated versions of Minecraft. This project takes the iconic mechanics of the classic mod and integrates them into modern versions of the game.
PixelColonies: Arcane Journeys
Dimension and Exploration Modpack with very hard Bosses and other Creatures, as well as many diffrent dimensions and Quests
Voiduh x Cobblemon
A combination of Exploration, Bosses, and Cobblemon
灾厄音乐包(calamity music pack)
I replaced some of the music in Minecraft with the music from Terraria Calamity mod, such as the main menu theme, ambient music, boss battle themes, Doomsday Poem BGM, and some sound effects. I hope these sound effects can enhance your game experience.
Sky Temple
This datapack adds the sky temple structure: a structure generated in the sky, containing a custom vault, a boss with custom loots and a giant mask (when wore, it turns you into a giant)
Warden Boss
Makes the Warden a REAL Boss
Cobblemon Gamma
Pokemon Cobblemon Pack - QoL and Performance mods! The server included in the modpack has Raids, Gyms, Mega Evolution, Tera, Alpha Bosses, Paradox, Legendary Pokemon, GTS and more!
Inclusive+
Explore the world, Build a Base, Fight Bosses, Raid Dungeons do what you feel like and enjoy the adventure how you want!
Eclipse Of Arcanum
you are in a new world, you only have your imagination, the goal is to defeat all the bosses
ReniDrags Molten Mayhem!
Explore the new biome that brings dungeons, dimensions, a custom boss, cool new custom items and of new tools!! Get on this mod baby!! Its super duper cool (source trust me bro)
TYAZVR Spider-Man
This mod is a Spiderman mob at add new things to do Bosses to fight this and is not the best but try
Castle and Farm
Farm and bossfight
ZKQ – Zombie King Quest (Boss Fight + Structures + Progression)
Adds a powerful Zombie King boss, custom structures, Frux ore progression, and epic weapons for adventure-focused survival gameplay.
ultimatium weapons
get the power to progress to high power with hard bosses
Tower Of Gods
This datapack adds the Tower of Gods (inspired from zelda wind waker) along with a custom boss: Gohdan (from zelda wind waker). No resource pack
RogueCraft Plus
An addon to the RogueCraft datapack! Adds new abilities, structures and a boss!
TerraSounds (Reactive Music songpack)
Adds more music in your world. Day, Night, Rain, Boss & more.
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
Deepcraft
A hardcore Minecraft mod with new ore, weapons, bosses, mobs, a unique dimension, haunting music, and forgotten secrets waiting to be uncovered.
Boss Checklist - Mob AI Tweaks Compatibility
Integrates the Ominous Phantomare boss as well as the reworked Elder Guardian and Ravager from Mob AI Tweaks as entries in the Boss Checklist mod.