Minecraft Java 1.21 Mods
Browse 189 free mods for Minecraft Java 1.21 — popular picks include Alternative Twilight (Remastered version), OutCombatLog, Techless.
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Alternative Twilight (Remastered version)
Added more mechanisms to the bosses of Twilight Forest, making it more time to prepare for them
OutCombatLog
✨ Anti-PvP leave, Item CD, Punishments. BossBar, sounds, chat messages, and more!

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
ZApocalypse
ZApocalypse is a Fabric mod for 1.21.1 that turns every night into a zombie wave, with elite variants, blood nights, and a Zombie Lord boss. As the apocalypse escalates, zombies evolve unique abilities while other hostile mobs retreat deep below Y=25.
The Mob
Mob Framework | YAML | Boss Phases | Radar HUD | AutoSpawn | Player Stats | 1.21.+
Minecraft-The CATASTROPHE mod
Adds new bosses to the base game, and overhauls the progression

Hyrinity (Legacy)
An overall content mod adding progression, bosses, dimensions and more!
Easter Holidays
Transform your server into an Easter event with egg hunts, rare bunnies, stats, bosses, quests, and more.
More Hide Gui
This is a small mod that lets you hide unnecessary UI elements, specifically status effects and the boss bar. I originally created it for personal use, but I thought some of you might find it useful too! :)
Crowned Herobrine [LEGACY]
Adds a new boss called Crowned Herobrine that is a formidable opponent. He drops a useful crown ;)
DestructionSMP Plugin
This Plugin adds Mace of the heavens, Excalibur, a god spear, god armor, and custom boss drops
BossBar Announcements
This is a Minecraft plugin that displays server-wide announcements as a boss bar with time-based progress indication.
World's Whisper
Conquer shape-shifting bosses and craft elemental gear in a realm ruled by four mystical seasons.
Rare Item Hunter | Rare loots, powerful bosses and epic upgrades
Bosses | New Enchantments | New Crafts | New Mechanics | Fully Configurable
Cool Bosses & Crafts I - Data Pack
A new datapack focused on adding several new craftings, new enchants and new music disks and alot more in the future.
Elysian Horizon
A beautiful modpack with a lots of custom mobs, bosses, tools and mechanicts
AnnounceX
📢 Professional announcements with custom durations, colors, sounds & particles! Title + BossBar modes. Perfect for events! ⚡
NexusMobs
NexusMobs is a comprehensive RPG plugin that transforms your Minecraft server by introducing over 20 unique bosses
SuperRH bosses
This mod adds some uh cool stuff like a very strong boss and a total red biome
UHC+
A data pack that adds in UHC, but with additional features like augments, special items/equipment, and bosses that spawn in during the game.
FriedZane
A mod that adds new items and bosses that relates to the minecraft youtuber "FieryZane" and adds new awesome features to make minecraft more destructive and fun!
MrAuctionsBid
MrAuctionsBid is a comprehensive auction plugin that allows players to create and participate in item auctions with an intuitive BossBar interface.

LootShare
Tired of divvying up loot after bossfights?
Summoners
Turns ordinary mobs into mini-bosses that summon reinforcements.
Corrupted Horizons
Add Mini-Bosses! Increase Difficulty, Earn Rewards And Begin Your Adventure! 🧭⚔️
Robot Legion
Build a steampunk robot army. Workers automate jobs while combatants fight beside you through three boss dungeons. Trade with engineer villagers for rare parts.
In the Journeys
The mods expand Minecraft further with new ores, mobs, biomes, dungeons, bosses, and magic to discover.
Trails of Forsaken Lands
Adventures, a lot of bosses, and crystals!
hCaptureEvent
WorldGuard-based capture events with scheduled zones, player and clan modes, rewards, boss bars, particles and PlaceholderAPI support.
AllItemsMini – Mini All Items Challenge
Lightweight all-items challenge with bossbar & timer
BossesChaos
Wield legendary weapons and challenge unique, powerful bosses hidden across the world. Defeat the chaos, survive deadly mechanics, and claim epic rewards!
MagicAirdrops
Replace boring airdrops with new events with various rewards and bosses.
7 Deadly Sins : Reworked
A feature-rich Paper 1.21.1 plugin introducing 70 custom enchantments, raid bosses, progression systems, and party-based gameplay inspired by the Seven Deadly Sins.
SimpleGPS
Advanced GPS navigation with interactive GUI menus, realtime Bossbar/Actionbar tracking, visual destination particles, Economy integration, permission limits, and SQLite support.
Warden Fight: Reimagined
A vanilla-like overhaul of the warden boss fight
Sauling of Ascension
A wacky mod that turns minecraft into a boss and tech based progression game!