Fabric Mods for Minecraft 1.21
Browse 17 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
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.
Boss Ultimatum
Heal bosses when players die, or remove them!
Void's Titans
This Datapack will add 28 new bosses and 4 new superbosses! The Titans are nothing short of walking calamities.
[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.
World's Whisper
Conquer shape-shifting bosses and craft elemental gear in a realm ruled by four mystical seasons.
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.

LootShare
Tired of divvying up loot after bossfights?
Project: TitanSlayer
Slaughter Mobs and Bosses in a Doom Style
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
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.