Minecraft Java 1.21 Mods
Browse 18 free mods for Minecraft Java 1.21 — popular picks include Arthropod Phobia Expansions + Horror Bosses (Spiders, Arachnophobia), Pumpkillager's Quest, Invincible: Overdrive.
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Arthropod Phobia Expansions + Horror Bosses (Spiders, Arachnophobia)
ArPhEx: Intricate, phobia-inducing, realistic mobs, and supernatural bosses
Pumpkillager's Quest
🎃 SpookyJam 2022: Help out the Pumpkillager! With custom encounters, rewards and a boss fight you'll get immersed in the story. Spawn him by breaking a pumpkin in this spooky scary Halloween style mod!
Invincible: Overdrive
A Modpack base on the comic and TV show "Invincible", focusing on the mod "Invincible Conquest", bringing in challenging adventure with difficult mobs and bosses to conquer
Gateway of Doom
Throw a Devil Eye to open a configurable combat gateway. Survive random or fixed waves, bosses and timed challenges for rewards—or suffer debuffs. Includes auto gateways, custom mobs, profiles, admin menus, commands, diagnostics, plus a stable add-on API.
KinglyBosses
KinglyBosses is a Minecraft plugin for managing custom bosses. It allows summoning powerful bosses, generating custom items, and enabling player spectating. It also offers features like boss lists, spawn zone management, and easy configuration reloading.
DeadSummons
This adds Magic of evil. We have three magic types, one boss. and items for your world!
Fortnite 3: Victory Royale
Featuring GUNS, BOSSES, OP WEAPONS & ARMOR, MAGICAL CROPS, INSANE TECH this pack is loaded with crazy mods that'll throw you on a wild ride
CrazyMC - A Special Apocalypse | Apocalypse with Quests!
A chaotic Minecraft adventure featuring zombie hordes, powerful bosses, firearms, magic, advanced technology, massive dungeons, and endless progression.
NexusMobs
NexusMobs is a comprehensive RPG plugin that transforms your Minecraft server by introducing over 20 unique bosses
Grandia Dungeons [Modpack]
A dark fantasy dungeon roguelike modpack with bosses, classes, cursed loot, magic, custom UI and atmospheric progression.
The Choppa Age Update
This mod adds Choppas, Chopper Golems, Choppa Chests, and a new Choppa Golem boss to Minecraft. There are new items such as the cleavers, and a new extremely common biome called the wastelands.
GiantZombie
summon and battle a colossal zombie boss with customizable stats and drops!

randomitems-mod
Adds /randomitems, /randommobs, /randomweapon, /randomarmor, /randomtool and /randomquest commands that periodically give random items, spawn random mobs, swap your gear, or assign 5-minute random quests with a boss bar and personal sidebar.
Boss Baby Disc 11
Adds felfeb's boss baby song over disc 11 (request by s_0laris)
Cursed Limitless Resonance Data Pack (26.1.2, 1.21.11)
Cursed Limitless Resonance Data Pack brings anime-inspired cursed energy powers, special tools, and dangerous bosses to your survival world. You can charge up cursed energy to strike with crushing critical hits, unleash famous special moves, and summon tough minibosses for unique drops. Every technique fits right into survival gameplay with craftable items and power progressions. […]
Arthropod Phobia Expansions Mod (1.21.1, 1.20.1) – Face Your Fears
Arthropod Phobia Expansions Mod is an advanced RPG and horror-themed mod designed to expand Minecraft's endgame with realistic arthropods and terrifying stalker bosses. Features: Stalker Bosses These are relentless, death-bringing entities with advanced AI to track and hunt you across great distances. Hallucination entities and lightning strikes signal their presence. They can also be summoned […]
Primal Solstice Rise Mod (1.21.1, 1.20.1) – Summon the Devil for Multi-Phase
Primal Solstice Rise Mod adds a dark boss battle against The Devil to the world. Players hunt goats for rare drops, brew dark artifacts, and trigger a ritual inside plains biomes to spawn a combat arena. The encounter challenges players through two distinct combat stages filled with lightning strikes, fire projectiles, and minion waves before […]
Fights&Frights Mod (1.21.1, 1.20.1) – Battle Creepy New Monsters
Fights&Frights Mod fills your world with new monsters and hidden bosses. It adds creepy creatures to different biomes while keeping the classic game feel. Features: Boss Fights: Lets you summon powerful bosses using a special item called the Ominous Hex. Undead Infection: Includes a pathogen effect that starts a zombie-like pandemic if you turn it […]