Forge Mods for Minecraft 1.21
Browse 223 free Forge mods for Minecraft 1.21 — popular picks include Croparium: Cataclysm, Boss Checklist - Annihilation Recreated Compatibility, Boss Warps.
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Croparium: Cataclysm
Turn L_Ender's Cataclysm ores into farmable crops— grab materials once, and regrow them nonstop, instead of endless boss-hunting!
Boss Checklist - Annihilation Recreated Compatibility
Integrates the Annihilation boss from Annihilation Recreated as an entry in the Boss Checklist mod.
Boss Warps
A lengthy escapade and a fierce scrimmage, followed by an effortless return home. Based on the Boss Rifts mod by jodlodi, but for the Modrinth ecosystem!
Hazelia
Hazelia dimension, creatures, and boss!
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.
Compound V: Survival Crafting & Chest_Loot Addon
Compound V: Survival Crafting & Exploration Addon adds Overworld crafting recipes and balanced structure loot tables for Temp V, Permanent Compound V, and Anti-V serums, removing the need for endgame boss fights.
Boss Checklist - Voidscape Compatibility
Integrates the augmented Null Servant bosses as well as the Corrupted Pawn from Voidscape as entries in the Boss Checklist mod
Harsh Encounters
Adds custom strong bosses to the game.
Terra-Nova
Minecraft with bossfights, automation and physics!
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.
The Titans
This Modpack add The Titans and other boss and titans mod!
glorbins armoury
a mod that contains epic weapons and supreme bosses
Harry's Hostile Expansion
Adds many different hostile mobs, mechanics, structures & bosses.
Explorer´s & Marriage
A light modpack with structures, bosses and the chance to have a happy family
Boss Checklist & Field Guide - Harrowing Hells Compatibility
Integrates the Cinderscourge boss from Harrowing Hells as an entry in the Boss Checklist mod.
DeadSummons
This adds Magic of evil. We have three magic types, one boss. and items for your world!
OHPS10 Boss
Adds the boss "Obama Harry Potter Sonic 10"
Bosscraft 2: Remake
Bosscraft 2: Remake is an unofficial project inspired by Sthullen's famous mod for older and outdated versions of Minecraft. This project takes the iconic mechanics of the classic mod and integrates them into modern versions of the game.
Sky Temple
This datapack adds the sky temple structure: a structure generated in the sky, containing a custom vault, a boss with custom loots and a giant mask (when wore, it turns you into a giant)
Eclipse Of Arcanum
you are in a new world, you only have your imagination, the goal is to defeat all the bosses
Castle and Farm
Farm and bossfight
ZKQ – Zombie King Quest (Boss Fight + Structures + Progression)
Adds a powerful Zombie King boss, custom structures, Frux ore progression, and epic weapons for adventure-focused survival gameplay.
ultimatium weapons
get the power to progress to high power with hard bosses
Boss Checklist - Mob AI Tweaks Compatibility
Integrates the Ominous Phantomare boss as well as the reworked Elder Guardian and Ravager from Mob AI Tweaks as entries in the Boss Checklist mod.
Iron Islands
Adds 6 different dimensions and 4 bosses.
CrisisCraft
This mod pack features Magic, Battles, Bosses, and a new immersive gameplay experience.
The World of Crackers
A new cracker biome with a new boss!
POIs and Raid-Bosses
Trigger raid‑style events at custom Points of Interest where players sacrifice items for rewards and hidden enemy challenges.
We The Horsemen
We The Horsemen – A modded Minecraft experience focused on economy, automation, and adventure. Build with Create mod, trade in a player-driven economy, and conquer bosses across dimensions. Hard mode, no easy teleportation—logistics and teamwork matter!
BossCrab's Item Expansion
A mod made to expand items and gameplay! Have Fun!!!
re;Tensura
🧬 ᴿᵉ;tensura — A TTIGRAAS Minecraft SMP featuring factions, PvP, skills, nations, bosses, dungeons, and constant progression. Active staff, balanced gameplay, events, and a custom 1.21.1 modpack. Join: https://discord.gg/Ya6BA38uUY
Luminae
A Steampunk Fantasy Exploration with over 7+ dimensions with bosses and legendary loot
Lava Chicken Boss
Adds a new boss and an exciting battle with him, as well as his minions and some items.
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!