Fabric Mods for Minecraft 1.21
Browse 29 free Fabric mods for Minecraft 1.21 — popular picks include Ender Dragon Fight Remastered, Withering Heights: Revamped Wither, Nice Mobs Remastered.
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Ender Dragon Fight Remastered
A difficulty increase of Minecraft's final boss, with a focus on a somewhat Vanilla feel.
Withering Heights: Revamped Wither
Turning the Wither into something worth calling a boss.
Nice Mobs Remastered
Randomised mob equipment, 10 new mobs, 3 new bosses, a new late game dimension and more
Boss Music Mod/Datapack
This mod adds music that will play during epic frays against both the Wither and the Ender Dragon.
Brutal Nightmare : Insane Difficult
Minecraft too easy? Try this mods with nearly 40 modifiers - settings new mini bosses, which made minecraft become hard & insane. Enhanced hostile mobs' AI & Angry passive mob. Zombie place/break blocks. Skeleton,Spider,Creeper,Enderman.
EvoPlus
Auxiliary mod for PrisonEvo mode of DiamondWorld project, which includes functionality of boss timers, quick menu, hotkeys for rune sets and many more various features.
Boss Ultimatum
Heal bosses when players die, or remove them!
Boss Score Toggle
Toggle bossbar and scoreboard visibility with commands!
Configurable Boss Bars
A simple mod allowing for the configuration & stacking of boss healthbars
Epic Battle Music
Automatically adds epic battle music when fighting bosses with 200+ HP within 80 blocks.
Relics of Ruin
A custom weapon system featuring boss-themed swords with unique abilities and mechanics.
Cobblemon Dungeon
Create and edit custom Cobblemon dungeons directly in-game with areas, gates, trainer encounters, boss battles, Join NPCs, rewards, and JSON-based advanced customization.
[WIP] DragonFist Legacy
(INCOMPLETE and WIP) Adds martial artists to Epic Fight, along with new content, structures, and mini-bosses throughout the world.
koper_mod
A chaotic Minecraft mod with unique bosses, broken armor sets, and a corrupted dimension a little unbalanced but fun as hell.
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.
More Hide Gui
This is a small mod that lets you hide unnecessary UI elements, specifically status effects and the boss bar. I originally created it for personal use, but I thought some of you might find it useful too! :)
World's Whisper
Conquer shape-shifting bosses and craft elemental gear in a realm ruled by four mystical seasons.

LootShare
Tired of divvying up loot after bossfights?
Robot Legion
Build a steampunk robot army. Workers automate jobs while combatants fight beside you through three boss dungeons. Trade with engineer villagers for rare parts.
Sleep Vote
Sleep Vote adds a configurable multiplayer night skip voting system to Minecraft, letting all players vote to skip the night with interactive chat buttons, boss bar feedback, and optional automatic night votes.
Project: TitanSlayer
Slaughter Mobs and Bosses in a Doom Style

Chaos Structures
Every 60 seconds, a random player is chosen and a random vanilla structure spawns nearby. Players receive countdown warnings and a bossbar timer, turning every world into unpredictable chaos.
Zombieium
Zombieium adds configurable night-time zombie waves and an optional boss encounter with a red warning beam, fiery arrival effects, and unique drops.
BossHeart
A mode that makes playing more comfortable
Amethyst Age
Expand Minecraft's amethyst progression with new tools, armor, weapons, food, a custom biome, Crystal Merchant, Crystal Warrior boss, advancements, and unique abilities like 3×3 mining, Tree Chopper, and Crystal Charge! 💜
Telum Solaris - At the Forest's Edge
Telum Solaris aims to add new weapons, armor and boss to minecraft for every stage of minecraft's progression. It is currently my first and only project!

randomitems-mod
Adds /randomitems, /randommobs, /randomweapon, /randomarmor, /randomtool and /randomquest commands that periodically give random items, spawn random mobs, swap your gear, or assign 5-minute random quests with a boss bar and personal sidebar.
Combat Effects Mod (1.21.1, 1.20.1) – Trigger Effects When Entities Enter Combat
Combat Effects Mod provides an effects system when entities participate in combat, helping to enhance the combat experience. Supports the use of regex to customize the effect activation conditions. Various effects can be applied to each situation, from boss fights to PvP, creating flexible combat mechanisms. Features: Trigger effects when entities enter combat. Regex support […]
Aethelgard Odyssey
Aethegard Odyssey is a medieval Minecraft modpack blending RPG mechanics with immersive exploration. It features custom dungeons, class-based progression. Expect challenging survival, magic, and epic boss fights.