Fabric Mods for Minecraft 1.21
Browse 103 free Fabric mods for Minecraft 1.21 — popular picks include The Catamount, Hostile Mob Better Configuration - HMBC, Hords.
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The Catamount
The Catamount is a mix between an ambiance and a boss mod
Hostile Mob Better Configuration - HMBC
Hostile Mob Better Configuration gives you full control over hostile mobs in Minecraft. Attribute and behavior, or turn mobs into powerfupl boss variants to create a completely new difficulty and combat experience. Each mob can also have its own name.
Hords
Hords is a survival mod for Minecraft that spawns dangerous mob hordes led by powerful bosses.
Relics Of The Fallen Gods
Relics Of The Fallen Bosses Adds custom Legendary Items that have a chance to drop when you kill a boss Items include: The wither Hammer Warden Chestplate and Ender Dragon Bow
Harrowing Hells
[NOW SURVIVAL SUMMONABLE] Adds the Cinderscourge, a highly developed boss entity with a diverse arsenal of attacks at its disposal. Usable in mob battles.
Boss Checklist - Friends & Foes Compat
Adds Friends & Foes compatibility to the Boss Checklist mod!
Zombie Survival Mod (ZSM)
Survive for 10 days fighting zombies with unique abilities. As the days progress, stronger zombies spawn, culminating in a final boss. Players can craft items, build defenses, and face various challenges to stay alive.
Mystborn Horizons
A progression mod to add more ores, mobs, bosses and structures.
Colossus Boss
Giant boss formed from the environment and attacking and hurling chunks of environment at you!
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.
[WIP] DragonFist Legacy
(INCOMPLETE and WIP) Adds martial artists to Epic Fight, along with new content, structures, and mini-bosses throughout the world.
Nightlancer
Adds an ominous boss on horseback
Summoner Mod
A mod that adds 4 bosses and 4 structures. Almost no dependencies!
Minecraft... But Enhanced!
A Vanilla+ Modpack with immersive gameplay, Reworked Mobs and Difficulty, More Structures, Reworked Bosses, More Music, and More!
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.
Darkest Garden
Adds a new boss to the Pale Garden!!!
Tales of the Third Age - Balrog
Adds a Balrog Boss to your Middle Earth modding experience!
creeper-apocalypse
Mob Replacement System ALL mobs spawn as Creepers! with exceptions Exceptions that remain normal Blazes you still need blaze rods! Villagers or trading Ender Dragon final boss remains Iron Golem
Muck Bosses
A Mod that add Muck Bosses To Minecraft!
Breeze Island
Adds a sky island with loot and a boss fight.
World's Whisper
Conquer shape-shifting bosses and craft elemental gear in a realm ruled by four mystical seasons.
Mine RPG
This is combination of mods to add more content to Minecraft including bosses, biomes, creatures. This is more RPG adventure style while keeping all vanilla. No extra metals or materials are added on this pack.

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.
The All Powerful Ender Chicken
Minecraft's hardest boss!
Poke card
This Projekt adds an poke Card with that you can capture and release Mobs anywhere. But not endbosses.
Project: TitanSlayer
Slaughter Mobs and Bosses in a Doom Style
Mid Optimized Plus+
it's Mid Optimized but with extra mods adding new bosses , mobs , biomes and more..
Chill&Stay
This is a modpack for my private smp, includes new building blocks, new foods, mobs some new bosses and enemys, a lot of QoL features, and the necessery optimanizations
Nether chambers
Adds custom trial chambers, mace, boss and items to the nether
Esoteric
Animations, Visual Effects, Terrian Enhancements + Structures. This pack also includes rebalancing of bosses. which makes some mobs + bosses more difficult
Zombieium
Zombieium adds configurable night-time zombie waves and an optional boss encounter with a red warning beam, fiery arrival effects, and unique drops.
MehrPinguin
A mod adding penguins, biomes, structures, rituals, and bosses – currently only available in German language.
BossHeart
A mode that makes playing more comfortable
The game Built For YOU
This modpack is somewhat "lightweight" this adds a few new mobs bosses and features have fun!