Minecraft Java 1.21 Mods
Browse 12,434 free mods for Minecraft Java 1.21 — popular picks include YCK's Auto Torch, Progressive Difficulty Scaler, Programmable Robots.
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YCK's Auto Torch
This mods adds an toggleable item that automatically places your torches when the lights level is low!
Progressive Difficulty Scaler
Light mod that scales hostile mob health and damage to match progression, so later gameplay and hardcore worlds are actually difficult.
Programmable Robots
adds programmable robots to the game which you can program in the day, and get run at night
Solute Extras
More enchants, better craft and smelt recipes and fair mob drops in an expansion of Solute.

Failed Breeding
A simple mod that gives mobs a chance to fail at breeding!
Countered's Weak Spots
A mod that aims to improve Minecraft's crit system by adding Weak Spots to enemies
Living World
A mod that aims to expand on the lackluster exploration, immersion, and looting of Minecraft!
Dyable BossBars
dye bossbars different colors

HMobs
Various animals, each having unique features!
Animal Pens Paperized
Simple plugin that allows to put animals into pens instead of having them roaming around the world
Muffles&Truffles
This mod adds a mob to the game called the shroomkin, the shroomkin is a wandering trader esc type mob with some mechanics mixed in from the pilgin, if your looking to overhaul the mushroom fields were your mod!
duck mod
a mod that adds a duck to your minecraft world and you can feed the duck with a new item
No More Villagers
Stops Villages from generating
Advanced Mob AI
Advanced Mob Intelligence plugin
Nostalgia Blocks
Use Classic textured Minecraft blocks without resource packs and build to your heart's old content!
TimberTweaks
🌲This texture pack was made in a simplistic vanilla theme with the goal to add light weight changes such as new music disc music, cleaner crosshair and a darkened/leafy GUI. more saturated (colorful) texture colors and ETF and EMF mob support.🌲
Force Mob Challenge inspired by BastiGHG
Kill a Random Number of this Mod and try to beat the Ender Dragon.
Adaptive horde
Adaptive Horde adds progression-based mob waves that scale per player gear score. Configure custom waves, drops, and pacing per dimension (Overworld/Nether/End). Supports modded mobs/weapons with JSON overrides, boss bars, and live reload.
Labyrythm
Labyrythm is a Neoforge mod for Minecraft 1.21.1 that challenges players with a procedurally generated, sound-reactive maze and a unique boss encounter.
oSzoukaua's: Cerulean Wisp
Adds a craftable wisp entity, that provides night vision
Stay Young
Keep animals small/baby
unfamiliar
A horror mod adding creatures, structures, and biomes to your world. Do not believe everything you see.
Sniffer Reimagined
Adds new features to make the Sniffer more interesting.
Slayer Quests
Serverside mod that allows Nitwits to assign OSRS slayer style quests, also works as a library for adding quest functionality to your own mobs
Lex's Dragons
This mod adds a variety of Dragons!
Panda's Brilliant Journey
PBJ is a 1.21.5 vanilla+ pack focused on enhancing exploration through new world generation, structures and mobs.
Cobblemon: Generation Spawns
A Cobblemon Side Mod that allows you to enable or disable certain generations from spawning.
Magic Egg
A throwable egg that converts mobs into spawn eggs
Progressive No Structures
This datapack allows you to make progress and even beat the game in worlds with Generate Structures disabled!
Shadow Clones
Naruto Shadow Clones are here!
Golams
Adding new entity to the game that will help you automate your world !
Fast Kits
QuickKit lets you save your entire Minecraft inventory as named kits and instantly load them whenever you need them. It includes commands, a GUI, and reusable Kit Binders while preserving enchantments, components, armor, offhand items, and custom names.
Amethyst - Echoes
Adds a new cave biome filled with amethyst-themed mobs, structures, and gear. Mysterious, dangerous, and radiant.
Ride Any Mob
Mount and control every mob in Minecraft!
LOWENDCRAFT
Lightweight Minecraft 1.21.5 modpack for low-end PCs — adds animations, new structures, challenges, animals, skills, and constant updates with fresh content.
Better Mob Griefing GameRule
BMGG (Better Mob Griefing GameRule) allows you to control mob_griefing for each entity.