Minecraft Java 1.21 Mods
Browse 190 free mods for Minecraft Java 1.21 — popular picks include UltraRituals-Free, MythicKorra - Advanced ProjectKorra & MythicMobs Integration Addon, Sleep Vote.
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UltraRituals-Free
Offering altar system to summon bosses, free version
MythicKorra - Advanced ProjectKorra & MythicMobs Integration Addon
Expand your MythicMobs bosses with element-based mechanics, statuses, conditions and more!
Sleep Vote
Sleep Vote adds a configurable multiplayer night skip voting system to Minecraft, letting all players vote to skip the night with interactive chat buttons, boss bar feedback, and optional automatic night votes.
Godmode- wither rework
This mod entirely reworks the wither boss in minecraft, with custom loot, moveset, etc
Project: TitanSlayer
Slaughter Mobs and Bosses in a Doom Style
CobbleCatalyst
Adds Cobblemon trainer battle phases to Cataclysm boss fights, turning boss fights into hybrid combat and Pokemon battle challenges.
Inferno World
Dimension, epic boss battle, and tools inspired by a magical hell
WarFmod
A mod that adds new mobs and bosses to your world, as well as new features and items.
Sculk Wrath
Sculk Wrath is a complete Warden boss overhaul datapack that transforms the Warden into a 4-phase boss fight with custom attacks, boss bar, music, configurable drops, and dramatic animations.
Chaos Structures
Every 60 seconds, a random player is chosen and a random vanilla structure spawns nearby. Players receive countdown warnings and a bossbar timer, turning every world into unpredictable chaos.
Custom Boss Zoryth AI
Zoryth AI Boss is a premium, high-performance custom boss framework for Paper (1.21.x).
BBAds
Want to capture your player's attention? Use bBAds to display custom messages via the BossBar. Features include configurable server ads, player-submitted content, a regex filter, and robust admin controls. Tailor messages to match your server's style.
AMGHud
💰AMGHud💰Bossbar HUD, TAB List💰
Artifacts and Bosses
This mod adds new gems that can be collected from 4 new bosses
Zombieium
Zombieium adds configurable night-time zombie waves and an optional boss encounter with a red warning beam, fiery arrival effects, and unique drops.
DeathBeacon
A lightweight Paper plugin that marks death locations with infinite particle beams and dynamic Boss Bar timers for effortless item recovery.
BossBarUltra
Modern floating health bars for mobs using Minecraft’s TextDisplay system. Lightweight, customizable, and perfect for RPG and PvE servers.
BossHeart
A mode that makes playing more comfortable
BossReng's UI Mod
Boss_Reng and various Lofi music creators bring you the best visuals and the most comfortable acoustic experience in Minecraft!
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
MOAR Tools
MOAR Tools is a progression and combat expansion mod that adds three new gear tiers, two dungeon systems, a full boss encounter, and a suite of custom mobs all designed around a dark, End-themed aesthetic.
Antique Odyssey
A progression-focused adventure modpack where ancient magic, powerful relics and mechanical engineering shape your journey. Explore a world filled with dangerous bosses, forgotten ruins, powerful spells and intricate machinery.
Steve's Custom Bosses Data pack
This data pack adds custom recipes, advancements, challenges, and bosses to the game, all with vanilla mechanics!
Total XP Rewards
Track lifetime XP and trigger custom rewards! Includes a dynamic BossBar system.
Custom Boss Template
Easy custom boss template for Minecraft 1.21+. Fully configurable health, name, appearance, phases, attacks, messages and rewards. Perfect for adventure maps and servers.
GTBC's Cataclysmic Boss UI
Adds a pre-fight boss information screen with lore, mechanics, attack details and tips for L_Ender's Cataclysm bosses!
VisionBar
VisionBar - It will broadcast every 3 minutes on boss-bar
Anti Magick: Bosses of Mass Destruction
Optional Anti Magick integration that suppresses selected supernatural boss actions and summons
SeasonManager
A powerful, Folia-native server lifecycle engine that automates seasons, phases, and grace periods for modern Minecraft networks. Providing autonomous scheduling with high-performance execution and premium visual feedback via BossBars and Titles.
Novaryn Announcer
A lightweight and highly configurable announcement plugin with chat, action bar, title, boss bar, sound, PlaceholderAPI, hex color, and clickable message support.
Anti Magick: The Twilight Forest
Optional Anti Magick integration that suppresses Twilight Forest portals, magic abilities, summons, and selected boss actions
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! 💜
Monsterwalll's Bosses And Stuff
A mod I made that adds Bosses, Structures and more! Note that this is my first mod so please comment what you think should be fixed in future mods.
Endorium Mod
Endorium is an end-game expansion mod for Minecraft that introduces a new mini boss, new wood type and new tier of equipment beyond Netherite.
chicken boss
Adds a powerful God Chicken boss that attacks players by spawning creepers and iron golems.