How do I install Bacillus?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Bacillus work with?

The listing gives Minecraft 1.21.2, 1.21.3. This is the version stated by the author or source site, not something we verified ourselves.

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Bacillus

by ATPStorages · on Modrinth

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric2 builds
Mod loader NeoForge2 builds

Minecraft version

Minecraft 1.21.2–1.21.3Newest
Minecraft 1.21–1.21.1

Minecraft 1.21.2–1.21.3Newest
Minecraft 1.21–1.21.1

⬇ Download for 1.21.2–1.21.3 · Fabric ⬇ Download for 1.21–1.21.1 · Fabric ⬇ Download for 1.21.2–1.21.3 · NeoForge ⬇ Download for 1.21–1.21.1 · NeoForge

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

This mod is a Work-In-Progress.

Bacillus is a remake of the mod Bacteria by TeNNoX.

Some textures used in the mod are from the Bacterium mod by InEqualMeasure.

We offer versions on CurseForge: https://www.curseforge.com/minecraft/mc-mods/bacillus

Requires the Architectury API

Forge version requires Kotlin For Forge

Fabric version requires Fabric Language Kotlin and the Fabric API

Destroyer Bacteria

An isometric view of the purple destroyer bacteria.

Takes in a set of blocks above itself as a filter and spreads to those blocks, destroying them.

Replacer Bacteria

An isometric view of the red replacer bacteria.

Takes in the block directly above it to replace blocks below it with the supplied block.
Blocks placed on top of the source block are used as a filter to only let the replacer bacteria target those blocks.

Both bacteria are activated using a redstone signal

Note: The block directly below the bacteria is implicitly added to the target filter.

Compacted Must

A green clump of goo; compacted must.

Used in crafting bacteria blocks and the jammer.

Jammer

A remote with a red and green wire sticking out of it; the bacteria jammer.

Used for jamming and/or killing all bacteria in the world.
Use in main hand for jamming bacteria.
Use in off hand for killing bacteria.

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.2, 1.21.3
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as bacillus-neoforge-1.3.1-1.21.3.jar — drop this file into the mods folder
Download size: 138 KB
Download link checked 31 Aug 2026 — working

These come from our own check of the pack file, not from the source page.

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All Mods for Java All Minecraft Java mods Java mods for 1.21