Mods for Minecraft Java
Browse 303 free mods for Minecraft Java — popular picks include Grandia Dungeons, Penguin Madness, Minecraft-The CATASTROPHE mod.
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Grandia Dungeons
A dark fantasy roguelike dungeon adventure with classes, bosses, cursed loot, magic, traders and procedural floors.
Penguin Madness
A mod adding Bossfights weapons and more!
Minecraft-The CATASTROPHE mod
Adds new bosses to the base game, and overhauls the progression
Ruinous
A minecraft mod that adds a bunch of stuff, including new mobs (2 bosses), new gear and new structures.
SpellCraft - Magic World
A Harry Potter-inspired magic mod adding wands, spells, wizard dueling, potions, a leveling system, magical creatures, a wizarding village with traders, and dungeons — including a boss lair and a dementor-guarded prison.
Darkest Garden
Adds a new boss to the Pale Garden!!!
Advancement Share
Shares kill advancements and XP from mobs/bosses with all players who dealt damage.
Star of the world
this mod will add new mobs, ores, food, bosses and totally new structures

Hyrinity (Legacy)
An overall content mod adding progression, bosses, dimensions and more!
the weirdest bosses ever
This an extremely weird mod which adds weird stuff and even a weird dimension you need 12 beacons to go there lol
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
Tales of the Third Age - Balrog
Adds a Balrog Boss to your Middle Earth modding experience!
Oscurium
This mod adds new bosses, items, tools, armour, mobs and dimensions.
MythicRewards | Boss kill reward/drop plugin with custom rule support | 1.20.5+
MythicMobs Support - Top damage rewards - 6+ reward type built-in - Create your own reward rule
Boss Update
This mod adds three new distinct bosses with custom drops and powers. (also available in multiplayer worlds.)

Prototype 0.3
currently just adds some custom armor and weapons not much. later there will be bosses, extra mobs, A third set of armor, even more weapons, maybe vehicles, and a lot more.
Crowned Herobrine [LEGACY]
Adds a new boss called Crowned Herobrine that is a formidable opponent. He drops a useful crown ;)
Thorm's Bosses
An action-packed End expansion adding 3 new dimensions, custom resource progression, and 8 legendary animated bosses with exclusive rewards.
More Ore -
Mod that adds more content and more ore to minecraft. New content includes bosses, dimensions, weapons.
NexusMobs
NexusMobs is a comprehensive RPG plugin that transforms your Minecraft server by introducing over 20 unique bosses
Summoners
Turns ordinary mobs into mini-bosses that summon reinforcements.
Holger Soup and Sorcery
This Mod adds many soup themed items to the game. Also a flying soup boiler that attacks you and a Soup Biome and Dimension. Also this mod adds the substance Holrosium and Holgarium, Crows and a Bossfight with Holger.
In the Journeys
The mods expand Minecraft further with new ores, mobs, biomes, dungeons, bosses, and magic to discover.
Cognitio
A chaotic world with strong monsters and bosses and cool artifacts with powerful abilities.
random things/stuff
random things i added with blockbench for models and mcreator this adds new ore mobs bosses blocks tools items and much much more
iMode
iMode adds witchery, custom spells, new mobs, 4 new bosses, an infinite dungeon dimension and makes game progressively harder. Also adds a level system. Everythig is toggleable in configurations.
GuardianOfNether
Just a boss protecting the Nether from visitors who would dare to enter the Nether 🔥
BossRewards
Reward top damage dealers in MythicMobs boss fights!
MagicAirdrops
Replace boring airdrops with new events with various rewards and bosses.
7 Deadly Sins : Reworked
A feature-rich Paper 1.21.1 plugin introducing 70 custom enchantments, raid bosses, progression systems, and party-based gameplay inspired by the Seven Deadly Sins.
UltraRituals-Free
Offering altar system to summon bosses, free version

Skillbound-RPG
Skillbound transforms Minecraft into a classic RPG with level-based skills, improved combat progression, magic, prayers, Slayer tasks, bosses, new equipment, and rewarding unlocks as you advance from levels 1–99.
Cube' Em
This mod takes the Rubik's cube to a whole new level and adds it all to Minecraft! We got new structures, new items, a new block, and an OP new sword that you can only get from killing my new boss!

IceNFireFactionsWeapons
this project is supposed to be another part of my other project about faction in iceandfire dragons, which will get released soon. it adds ancientite, a rare ore made of ancient dragon remains. it adds weapons, a boss, and armors
The Division
The Division adds two new dimensions, bosses, gear, and a narrative about creation and destruction. Explore a cybernetic realm and the corrupted "Beginning", forge legendary weapons, and uncover the secret behind the divide between worlds.
EssenceBound
Adds 4 new bosses with special items and a crafting levelling system for 2 of them :)