Neoforge Mods for Minecraft 1.21
Browse 260 free Neoforge mods for Minecraft 1.21 — popular picks include bosses' addition, Daily Boss x Iron's Spells n Spellbooks, Slammer Boss.
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bosses' addition
a great challenge for those who are bored from vanilla, all in vanilla.
Daily Boss x Iron's Spells n Spellbooks
Compatibility between Daily Boss and Iron's Spells 'n Spellbooks.
Slammer Boss
a mod that adds a new boss to the game
Ultimate Warden
A Datapack/Mod that enhances the Warden with a custom Dungeon, a Temple, boss battles, and more.
Confluence Infernum Music
Adds Infernum Music to Confluence: Otherworld (TerrariaCraft) bosses
The Catamount
The Catamount is a mix between an ambiance and a boss mod
Hostile Mob Better Configuration - HMBC
Hostile Mob Better Configuration gives you full control over hostile mobs in Minecraft. Attribute and behavior, or turn mobs into powerfupl boss variants to create a completely new difficulty and combat experience. Each mob can also have its own name.
Krakentilus
Adds the Krakentilus boss, 2 unique Nautilus variants and 3 spears
Daily Boss x Bosses of Mass Destruction
Compatibility between Daily Boss and Bosses of Mass Destruction.
Arda's Ultimate Golem
Arda's Ultimate Golem mod adds a powerful golem to the game, and this golem is a golem that helps you against bosses or creatures you fight.
True Boss Music
Adds much needed boss music to Minecraft's Bosses!
Monstrosteve
This mod adds a goofy boss mob.
The Old LMB
A Mod that adds new Bosses, more angry mobs and some animals from our planet
Boss AI Tweaks
Mob AI Tweaks but only the boss changes
Dimensions & Dungeons
Explore a new world full of undiscovered possibilities, with new dimensions, bosses, mobs and structures.
Aether Plus 2
💀 Conquer Bosses • 🐦Flying Pets • ☁️ Sky Is The Limit • ✨ Acquire Gear • 💎 Shaders| ✅ Play Now With Friends
Manifestation of the souls
Manifest your soul as a stand, kill bosses, follow quest lines and find structures
Epic Bosses
A mod for epic bosses in minecraft that adds a lot of unique content.
Hazelia
Hazelia dimension, creatures, and boss!
KamenRiderBossYOUandME
Henshin! Step into this heated conflict. In “The Final Boss, You and Me”, it's like the fateful duel of Kamen Riders. The shining belt is the symbol of glory. Amid the intertwining of light and shadow, only the strongest can break through the darkness
Harrowing Hells
[NOW SURVIVAL SUMMONABLE] Adds the Cinderscourge, a highly developed boss entity with a diverse arsenal of attacks at its disposal. Usable in mob battles.
Sol's Title System
A rich title progression system. Players earn titles by completing in-game achievements — slaying mobs, surviving, or defeating powerful bosses. Each title displays above the player's head and in chat, and can grant unique stat buffs while equipped.
Crowncrawl
It is a mod still in development that aims to improve the vanilla experience of the game by adding new bosses and items.
Daily Boss Per Player
Makes Daily Boss cooldowns per-player instead of server-wide.

Fortitude
Gain stats upon defeating unique mobs and conquering bosses. Fully configrable/customizable.
Harsh Encounters
Adds custom strong bosses to the game.
Contoro's Ores+
This mod adds ores and new tools and armor, but with a twist. The player needs certain leveled tools to get stronger ores. This mod also adds a new dimension and a new boss.
Titans - World Bosses
Pixelmon World Boss Sidemod
All About Mobs - Creatures & Bosses & Combat
All About Mobs enriches your Minecraft experience by adding a plethora of new creatures to discover and interact with, enhancing the dynamics of each biome.
LAir's Bosses
This mod adds two bosses to the game, The Spirit of the Forest and Zeus, along with a new structure: Olympus.
Minecolonies - Order and Chaos
This is the official modpack from the youtube serie "Minecolonies Caos e Ordem". Create your own colonie in a dangerous world with buffed monsters and bosses.
Daily Boss x Brutal Bosses
Compatibility between Daily Boss and Brutal Bosses.

ScalingMobs
Adjusts the stats of bosses and mobs, multiplied by the number of players on the server.
Diary of an 8-Bit Warrior
Experience Aetheria like a Terrarian! Complete quests, kill bosses, and level up your skills! Maybe you'll even meet Runt and his friends…
Harry's Hostile Expansion
Adds many different hostile mobs, mechanics, structures & bosses.

Deltarune Project
This mod adds various elements of Deltarune chapters 1 and 2 to Minecraft. There are many new materials and bosses added to the game.