Fabric Mods for Minecraft Java
Browse 14 free Fabric mods for Minecraft Java — popular picks include Withering Heights: Revamped Wither, Brutal Nightmare : Insane Difficult, Nightmare Mode [BTW ADDON].
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Withering Heights: Revamped Wither
Turning the Wither into something worth calling a boss.
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.
Nightmare Mode [BTW ADDON]
Nightmare Mode is an addon for Better Than Wolves CE 3.X that makes the mod a LOT harder, with focus on extreme difficulty, unforgiving mobs and reducing farming tedium. NM features new mobs, reworked mechanics and boss overhauls.
Configurable Boss Bars
A simple mod allowing for the configuration & stacking of boss healthbars
Relics of Ruin
A custom weapon system featuring boss-themed swords with unique abilities and mechanics.
Piglin Wither
Adds a new piglin wither boss
Bossmode
Bossmode is the difficulty above hardcore that turns every mob into a boss fight, including passive mobs. Can you survive?
koper_mod
A chaotic Minecraft mod with unique bosses, broken armor sets, and a corrupted dimension a little unbalanced but fun as hell.
Yori3o's Trash 'n Brainrot
Stinking trash cans, 5G towers, a new boss - everything you needed

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.
Boivindo
A gaunt bovine humanoid that doesn't hunt you, it grades you. It picks the best-fed player, always knows where you are, never runs, and cannot be killed. No boss bar, no chase music.

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.
Snorlax Boss
Adds Snorlax as new Endboss to minecraft
The Retch: Trauma's Echo
(NOTE - ON HOLD) The Retch is an adaptive psychological horror boss mod featuring relentless mob and strict anti-cheese mechanics. CONTENT WARNING: This mod features themes of severe psychological torment, trauma, and unyielding persecution from my youth.