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Mutationcraft Mod for Minecraft 1.20.1, 1.21.1

Adds new terrifying parasite mutant creatures into the game!

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Updated 02.11.2026
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About the Mutationcraft mod

Mutationcraft — screenshot 3

Mutationcraft adds a mutant outbreak to Minecraft.

Hello Mutationcraft lovers! I'm Sxilverr, the new owner of Mutationcraft (the former author is ASEStefan).

I have big plans for this mod, which includes a huge overhaul in the future. Right now, I have released the "Mutationcraft Legacy" which is the fixed version of the classic mod before the overhaul comes, so you can still play and enjoy the original!! :D

Modrinth Page

Requires: GeckoLib

Mutationcraft — screenshot 3

Outbreak System:

Every world has an outbreak timer that counts up overtime. At first only Miters will roam around. As the timer goes higher, stronger tiers of mutants start spawning:

  • Common: Assimilated Villagers, Pillagers, Witches, Wandering Traders, Humans and Roamers, assimilated animals (pigs, cows, sheep, horses, donkeys, wolves, foxes, bears, spiders), Assimilated Jockeys and Rotten Skeletons. Assimilated Piglins spawn in the Nether.
  • Parasites: Necroptors and Reductors.
  • Advanced: Human Stages 1 to 3, the Assimilated Enderman, the Assimilated Evoker and the Carnivorae.
  • Elite: the Assimilated Creeper, the Flayer, the Parasitic Ram and Roller, and Light and Medium Hooks.
  • Bosses: the Corrosion Queen, the Human Herder, the Resenter, the Parasitic Shooter and the Heavy Hook.

The stage (0 to 4) sets how early each tier unlocks. You can change it with /mutationcraft stage or the config.

Mutationcraft — screenshot 4

Spreading infection and Evolving:

  • Mobs and players killed by mutants are converted into mutants.
  • Mutagen Sickness turns mobs into mutants when it runs out or when they are killed.
  • Human Stages evolve into the next stage over time.
  • Assimilated Humans become Flayers after killing 5 Skeletons, and Necroptors become Reductors after killing 5 Zombies.
  • Hooks grow from Light to Medium to Heavy hooks.
  • Interacting with a Rotten Skeleton spawns The Intoxicator.

Mutants are hostile to every other creature.

Hazmats:

Hazmat Guards, Leaders, Medics and Flamethrowers patrol the Overworld with Scientists, and Hazmat Helicopters drop in more of them. They hunt mutants, so they can be good allies, or not.

Gear:

  • Infected weapons: the Rapier, Battle Axe, Nordic Axe, Pole Axe, Halberd, Cavalry Sword and Flanged Mace.
  • Flamethrower: runs on furnace fuel, overheats if you hold the trigger too long, and sets mutants on fire. Burning mutants take double damage.
  • Special items: the Fang Staff, Necroptor Bomb, Poisoned Orb, Assimilated Ender Pearl, Mutagen Serum and Totem of Immunity.
  • Armor: Metal and Rusted Metal armor.
  • Mutation Bane: an enchantment that deals extra damage to mutants.
  • Effects: Bleeding, Corrosion, Severen, Rage, Mutagen Sickness, Sign of Fire and Magic Exhaustion.

Config and Commands:

The config file lets you change mob stats, spawns, stages, evolution, items, and more. The /mutationcraft command covers stage, time, pause, resume, reset, infect, cure, count and purge.

Credits:

  • Sxilverr (Owner/Author)
  • ASEStefan (Former Author)
  • songsofsorrow and Jordaan (Legacy artists)
  • Nightfox (Legacy models)
  • Quicksounds, Freesound, Zapsplat and others were used for sounds.
  • The Some Items and Last Days resource packs were used for some assets.
  • Scape and Run: Parasites and other parasite mods for inspiration!

Mutationcraft Legacy is MIT licensed. The Revamp of Mutationcraft will be ARR.

How to install Mutationcraft

With Millida Launcher

  1. Install Millida Launcher

    The launcher is free: download it at millida.net/launcher and sign in with any nickname.

  2. Click “Install” on this page

    The launcher opens and installs the mod for Minecraft 1.19.4–1.21.1 on Forge or NeoForge automatically.

  3. Launch the game

    A profile with it appears in the launcher: click “Play”.

Manually

  1. Install Forge or NeoForge

    The loader must match the game version of the mod file, for example Minecraft 1.21.1. After installing it, a separate profile appears in your launcher.

  2. Download the file for your version

    In the version list above, pick the file mutationcraft-legacy-neoforge-1.1-1.21.1.jar (2.5 MB) for your game version and loader.

  3. Put it in the mods folder

    The folder is inside .minecraft (Windows: %appdata%\.minecraft\mods). If it does not exist, create it.

  4. Launch the loader profile

    Open “Mods” in the main menu: Mutationcraft should be in the list.

Minecraft 1.21.1 runs on Java 21: with a different Java version the game may close right after launch.

Versions

With dependencies

MinecraftLoaderFileDateActions
1.21.1NeoForgemutationcraft-legacy-neoforge-1.1-1.21.1.jar2.5 MB 3
1.20.1Forgemutationcraft-legacy-forge-1.1-1.20.1.jar2.5 MB 1
1.19.4ForgeMutationcraft [BETA]13.5 MB

FAQ

Which Minecraft versions does Mutationcraft work on?

There are files for 1.21.1, 1.20.1, 1.19.4. The newest is 1.21.1.

Is Mutationcraft for Forge or Fabric?

There are files for Forge: 1.19.4–1.20.1 and for NeoForge: 1.21.1. There are no files for Fabric: a mod for another loader will not start.

Does Mutationcraft need other mods?

The author lists no required dependencies: the Forge or NeoForge loader is enough.

Which Java does Mutationcraft need?

Minecraft 1.21.1 runs on Java 21. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.

Where can I download Mutationcraft safely?

On this page: the file mutationcraft-legacy-neoforge-1.1-1.21.1.jar (2.5 MB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: afd0bfda6b04581f47617f175a5fde771a3f2123.

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