Minecraft Java 1.21 Mods
Browse 18 free mods for Minecraft Java 1.21 — popular picks include Armageddon, DivineRPG, Gravestone Dungeons Data Pack.
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Armageddon
A highly configurable overhaul of Minecraft's way of progressing through the game : bosses, RPG-like, new mechanics, multiplayer compatibility, weapons, ores... !
DivineRPG
8 New Dimensions ♦ 115+ New Mobs/Bosses ♦ Hundreds of New Blocks and Items ♦ Unique Weapons and Armor
Gravestone Dungeons Data Pack
This data pack adds dozens of small and massive dungeons, bosses, custom loot, magic spells, many custom weapons, enchantments and much more!
Relics of Ruin
A custom weapon system featuring boss-themed swords with unique abilities and mechanics.
Harry's Hostile Expansion
Adds many different hostile mobs, mechanics, structures & bosses.
Deepcraft
A hardcore Minecraft mod with new ore, weapons, bosses, mobs, a unique dimension, haunting music, and forgotten secrets waiting to be uncovered.
stupid horror mod
this is a joke horror mod that adds a scary biome, where you have to kill scary creatures to collect scary souls to later craft into a boss altar and fight the boss. there is an ingot with good weapons that can take down most of the scary creatures.

Techless
A Mod that adds 3 new bosses with unique phases Fight them to craft Legendary weapons in this Vanilla+ progression mod Made using Mcreator
BossesChaos
Wield legendary weapons and challenge unique, powerful bosses hidden across the world. Defeat the chaos, survive deadly mechanics, and claim epic rewards!
Nation's Roots
Nation's Roots - a mod where you choose one of 4 Races with unique Nations. Your choice grants powers and flaws. Find a Star to change your Nation and defeat a race boss to claim their legendary weapon. Your roots define your power.
Folded Iron
A boss/item/weapon/after game content mod
Amethyst Age
Expand Minecraft's amethyst progression with new tools, armor, weapons, food, a custom biome, Crystal Merchant, Crystal Warrior boss, advancements, and unique abilities like 3×3 mining, Tree Chopper, and Crystal Charge! 💜
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.
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
KingCraft [FORGE]
Travel to a different planet? Fight new bosses? Discover new game mechanics? Welcome here.
Cataclysm Ignis Soulfires Mod (1.21.1) – Defeat Bosses with Soul-Infused Combat
Cataclysm Ignis Soulfires Mod extends the Cataclysm mod with powerful new soul-infused items. It adds a brand-new material called Souled Ignitium, which you can use to upgrade your weapons, tools, and armor. This addon changes how you fight by giving your gear special abilities and fresh mechanics. You also get new items like throwable tools […]
Dwarven Automatons Mod (1.21.11, 1.20.1) – Battle Steam-Powered Bosses
Dwarven Automatons Mod brings an ancient mechanical civilization back to life in your world. It fills deep underground caves and floating void islands with hostile machines powered by steam and gears. You get to explore massive industrial ruins, fight smart robots, and collect rare metal to craft new weapons. Features: Shared Loot System: Every player […]