Minecraft Java 1.21 Mods
Browse 55 free mods for Minecraft Java 1.21 — popular picks include Sculk Wrath, YouTuber Block Telugu Edition, Osimu Boss Fights.
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Sculk Wrath
Sculk Wrath is a complete Warden boss overhaul datapack that transforms the Warden into a 4-phase boss fight with custom attacks, boss bar, music, configurable drops, and dramatic animations.
YouTuber Block Telugu Edition
A fun Minecraft mod featuring famous Telugu YouTubers, custom blocks, and epic bosses like Evil YouTube
Osimu Boss Fights
This mod adds very unforgiving bosses and cool rewards. Most of them will be glass cannons, strength alone won't be enough.
The Legend Returns
Herobrine has returned. Cursed structures, shadow clones, epic boss fight, and dark portals await. Survive the apocalypse.
⚡EvilMobs - Create your custom bosses
Multifunctional Bosses with simple configuration
BulsciCraft
Enjoy this brand new mod that adds New Dimensions, Mobs, Items, Blocks, Unusual things and even a bossfight...

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.
Floreláis
Created in 1 week for my high school art class. It is a very basic mod adding 6 flowers and a boss. Similar feel as old 1.7.10 mods.
Chariz's Mayhem
A Minecraft Mod That Aims To Add Fun Things Into Minecraft, Such As New Mobs, Bosses, Weapons, Tools, Armor etc. Created By The Maniac Himself, DarkChariz
Everything Bossbar UW add-on
This Datapack adds Bossbars for every mob
Exto
This mod adds a unique horror mod boss that has a rare chance of spawning in the dark forest, the badlands etc.
Giant Boss
giant bossfight datapack using vanilla minecraft

Calamity Bosses
20 NEW bosses that will shift the power changes in your world, adding custom item rewards and custom blessings to ease your fare through this treacherous world.
King of the Nether X Fresh Animations Resource Pack (1.21.8)
King of the Nether X Fresh Animations Resource Pack makes the King of the Nether pack work perfectly with Fresh Animations. It combines the scary new looks for the Wither and other fiery mobs with smooth, natural movements. Now, you get the detailed boss designs without any broken models when you play. Features: Fixes Visual […]
Formidulus Mod (1.21.1, 1.21) – New Boss, Weapons, Structures And More!
Formidulus Mod is a horror mod that introduces a new soul-like boss into the game. The mod also adds new weapons, blocks, mobs, and structures. The mod is continuous development and new features will be added over time. A list of features as noted by the developer is given below. Features: 1 Challenging Soulslike Boss […]
The Wandering Murderer Mod (1.21.5, 1.21.1) – Hidden Horror, Dark Humor, And Deadly Milk
The Wandering Murderer Mod introduces a sinister twist to an innocent Minecraft character: the wandering trader. Kill one, and you'll trigger the wrath of the Milkman Reborn, a disguised boss-level mob who will hunt you for two days before rewarding your survival with a powerful weapon, Milkman’s Sword. Features: Adds a hidden boss encounter triggered […]
Blood Toll Pistol
The Blood Toll Pistol is a cursed weapon that deals 1000 damage to mobs, less to bosses. Right-click to fire a magical bullet with effects. Each shot costs 5 hearts, 3s cooldown, 100-use durability.
Fights&Frights Mod (1.21.1, 1.20.1) – Battle Creepy New Monsters
Fights&Frights Mod fills your world with new monsters and hidden bosses. It adds creepy creatures to different biomes while keeping the classic game feel. Features: Boss Fights: Lets you summon powerful bosses using a special item called the Ominous Hex. Undead Infection: Includes a pathogen effect that starts a zombie-like pandemic if you turn it […]
Fishing Expansion Mod (26.2, 1.21.1) – Catches Special Fish And Loot
Fishing Expansion Mod completely changes how you catch things in the water. It lets you find special items, maps, and strong armor just by using your rod. You can even pull real monsters out of the sea and fight a scary new boss. Features: Water Trail: Arrows leave a path of water behind them. Ender […]