Fabric Mods for Minecraft Java
Browse 15 free Fabric mods for Minecraft Java — popular picks include Withering Heights: Revamped Wither, Brutal Nightmare : Insane Difficult, Configurable Boss Bars.
Step by step: How to install Minecraft Java mods & modpacks
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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.
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.

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.
Yori3o's Trash 'n Brainrot
Stinking trash cans, 5G towers, a new boss - everything you needed
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.
Vivid AFK Camera
A beautiful cinematic AFK camera that starts smooth drone flights, plays music, and dynamically displays the server address or world name in the bossbar.
Snorlax Boss
Adds Snorlax as new Endboss to minecraft
Gundam Mech vs Horror & Boss Mods
Contains the Gundam Mech from Pomkot Mech Expansion Pack, along with Horror & Boss Mods to fight against. The Mechs cannot be crafted, only able to spawned in Creative!
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.