Neoforge Mods for Minecraft 1.21
Browse 76 free Neoforge mods for Minecraft 1.21 — popular picks include Deepcraft, Kings & Monsters, Headaches!.
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Deepcraft
A hardcore Minecraft mod with new ore, weapons, bosses, mobs, a unique dimension, haunting music, and forgotten secrets waiting to be uncovered.
Kings & Monsters
An adventure and progression mod featuring the Ogre Tribe, guarded outposts, escalating patrols, powerful relics, a massive fort, and a multi-stage boss fight.
Headaches!
Headaches! is a Minecraft mod that adds new structures inhabited by the most absurd and unconventional mini-bosses—all characterized by having disproportionately large heads. Discover a challenging new adventure!
Electric Boogaloo
Adds a new zombie dancing boss, Electric Boogaloo with his iconic Backup Dancers from the Plants Versus Zombies Games
Summonable Steve
A summonable Steve boss with complex AI and behaviors
Norious
Bored of not Having enough strong bosses to fight? Ever Wanted To become a God and fight Demons In Minecraft? This is the mod for you.
The Angry Ghast
Three new Ghast themed bosses, one for each dimension
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.
Basalt Arena
This mod adds 3 new bosses and a new structure to Minecraft.
Bosses And Mobs
Adds More Bosses To Minecraft,More Tools And Armor To Minecraft again...

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
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.

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.
Cowzilla
This mod adds in hostile cows, giant cows, and huge cow boss as well as cow based weapons.
More Ore -
Mod that adds more content and more ore to minecraft. New content includes bosses, dimensions, weapons.
BossesChaos
Wield legendary weapons and challenge unique, powerful bosses hidden across the world. Defeat the chaos, survive deadly mechanics, and claim epic rewards!
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.
DreadWalker
A mod adding a new boss, new weapons, tools, armor, and a magic staff.
Folded Iron
A boss/item/weapon/after game content mod
Cooper age
mod adds 2 metals and 1 alloy. You can make weapons, tools and armor with them. There is still 1 boss
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
Boss Weapons Mod
This is my first mod, so it's probably not very good. It adds some weapons for each mob that is generally considered a boss (Wither, Ender Dragon, Warden, and Elder Guardian).
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 […]
GeoSmelt Mod (1.21.4, 1.20.1) – A New Adventure Awaits
GeoSmelt Mod reimagines the Minecraft experience by introducing 12 unique ores with distinct progression paths. This mod adds a variety of tools, weapons, and even a new boss, along with several mobs and a new structure in the End to explore. Features: The mod features 12 ores, including Adamantium, Dark Iron, Starcinium, and more, each […]
Fishing Expansion (Fabric/Forge/NeoForge/Quilt)
Enhance the fishing experience with more loot, new enchantments, new boss, real mob fishing, special fishes, turtle armor and more!
TFM's Best of All Worlds (Lightsabers, Wands, Terraria, Bosses, etc.)
Merging a plethora of franchises into one Minecraft mod.
RPG Style More Bosses : Exoframe
Adds a new boss and new weapons to the game. Add-on for RPG Style More Weapons
KingCraft [FORGE]
Travel to a different planet? Fight new bosses? Discover new game mechanics? Welcome here.
Sea Myths: Legendary Ocean Monsters & Bosses Creatures
Face the Leviathan, Kraken, Bloop, Protector, and Sea Eater! Adds 7 massive ocean bosses and sea monsters with powerful scale armor. Includes rideable Bloops!
TFM's Mining Expansion (Drills, Ores, Bosses, etc.)
A mod that expands mining and exploration in the caves by adding drills, new ores, armor, weapons, and etc.
Soap's Weapons 'n Bosses
Mod filled with weapons and bosses from anime and games
Epic Bosses (Bosses)
A mod for epic bosses in minecraft that adds a lot of unique content.
Sabers And Bosses
Forge Six Legendary Krystal Saber Swords, each infused with unique Elemental Abilities. This mod introduces 4 NEW Bosses along with special drops for the Elder Guardian and Ender Dragon
Dread's RPG
Welcome to Dread's RPG, Fight New Bosses, Complete Dungeons, New Items and More on this RPG Mod
Boss Plus (Discontinued)
Adds new bosses to fight!
Evergrow
A brutal high-end adventure modpack packed with tons of new mobs, bosses, weapons and dimensions – heavily optimized and balanced for powerful PCs.