Neoforge Mods for Minecraft 1.21
Browse 260 free Neoforge mods for Minecraft 1.21 — popular picks include Bosses and things, Minecraft-The CATASTROPHE mod, Adaptive horde.
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Bosses and things
In this mod I added 3 new bosses and special items with them.
Minecraft-The CATASTROPHE mod
Adds new bosses to the base game, and overhauls the progression
Adaptive horde
Adaptive Horde adds progression-based mob waves that scale per player gear score. Configure custom waves, drops, and pacing per dimension (Overworld/Nether/End). Supports modded mobs/weapons with JSON overrides, boss bars, and live reload.

Hyrinity (Legacy)
An overall content mod adding progression, bosses, dimensions and more!
Labyrythm
Labyrythm is a Neoforge mod for Minecraft 1.21.1 that challenges players with a procedurally generated, sound-reactive maze and a unique boss encounter.
Grandia Dungeons
A dark fantasy roguelike dungeon adventure with classes, bosses, cursed loot, magic, traders and procedural floors.

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 ;)
Cowzilla
This mod adds in hostile cows, giant cows, and huge cow boss as well as cow based weapons.
Boss Update
This mod adds three new distinct bosses with custom drops and powers. (also available in multiplayer worlds.)
bear5
A joke horror mod that adds stupid monsters, and a boss.
Breeze Island
Adds a sky island with loot and a boss fight.
More Ore -
Mod that adds more content and more ore to minecraft. New content includes bosses, dimensions, weapons.
Elysian Horizon
A beautiful modpack with a lots of custom mobs, bosses, tools and mechanicts
SuperRH bosses
This mod adds some uh cool stuff like a very strong boss and a total red biome
Summoners
Turns ordinary mobs into mini-bosses that summon reinforcements.
Valentine's Girlfriends
Adds new interactive npc's and bosses!
In the Journeys
The mods expand Minecraft further with new ores, mobs, biomes, dungeons, bosses, and magic to discover.
bt stipram kokam
There's another world and a boss. There are enemies. Beauty. Everything is there. There are all kinds of furnaces. There are world settings. There are tools for armor and food.
Trails of Forsaken Lands
Adventures, a lot of bosses, and crystals!
Fortune Craft Modpack
The Official Modpack for the FortuneCraft Modded Server. Explore Minecraft in a new light with a heavy focus on Create, with the addition of new Biomes, Blocks, Mobs and Bosses!
Gnomeland
Gnomes with different types such as bosses and guards and structures.
BossesChaos
Wield legendary weapons and challenge unique, powerful bosses hidden across the world. Defeat the chaos, survive deadly mechanics, and claim epic rewards!
Chaosium
This mod is a new adventure for the player who will be able to face bigger enemy capable of killing them in a snap, this mod allows you to get new item, armor and block. Once well equipped and prepared the player can go to challenge the bosses
Villager BOSS MOD
Defeat the Crazy Villager BOSS!
Worlds O' Plenty II
A new & updated curated modpack featuring all sorts of experiences!: - Adventure! - Decorations! - Bosses and Mobs a plenty! And of course... *drum rolls* Plenty of Worlds to explore! - Updated to 1.21.1 Neoforge!
Garfield Mod
Adds Garfield as a hungry, whining boss fight – beat him and claim your well-earned lasagna!
Boogers & Snot
This minecraft mod gives you the ability to pick your nose, go to a new dimension, and even beat a boss!
The Choppa Age Update
This mod adds Choppas, Chopper Golems, Choppa Chests, and a new Choppa Golem boss to Minecraft. There are new items such as the cleavers, and a new extremely common biome called the wastelands.
Godmode- wither rework
This mod entirely reworks the wither boss in minecraft, with custom loot, moveset, etc
EssenceBound
Adds 4 new bosses with special items and a crafting levelling system for 2 of them :)

CobbleCatalyst
Adds Cobblemon trainer battle phases to Cataclysm boss fights, turning boss fights into hybrid combat and Pokemon battle challenges.
The last Soldier (TLS)
This mod adds rats, bugs, jellybears and bosses to the game
WarFmod
A mod that adds new mobs and bosses to your world, as well as new features and items.
ADKM
Defeat a powerful, giant boss roaming your world to claim his legendary Scythe with +16 Attack Damage! A high-risk, high-reward challenge. (Requires GeckoLib)
XDL的武器1
添加了几把武器和一些生物及一个BOSS Added several weapons, some creatures, and a boss.