Swarm Infection
Java mod listed for Minecraft 1.20. File opened and checked on 5 Oct 2026; downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.20.1 on Forge. On other versions it may install and then do nothing.





Mod adds Infection of the Swarm Meteorite drops on earth, carrying Swarmers Swarmers are amalgamations made up with flesh of the aliens they had assimilated. Swarmers attack any living creature, dissolving their flesh and turning it into biomass, they then merge with that biomass and become Amalgamated Amalgamated can evolve and create more swarmers
the mod adds a point system that increases with actions of Swarm Infection Higher the phase, higher the difficulty
Mod has multiple tiers of mobs
Swarmers: the start of the infection, they attach themselves to the mobs and merge with them
Amalgamated: the result of swarmer merging with their victim, can evolve into different variations
Grown: evolved variants of Amalgamated they get new abilities and strengths, can grow even bigger after killing enough mobs
Overgrown: even stronger variants of Grown, they mostly have the same abilities, but they are better or some of the overgrown could have new attributes
Nodes: mass of biomass that spread around the ground they can grant the Infection poition effects to make them stronger
Leviathans: created from nodes, they are large constructs of biomass that destroys everything on their path they act as main bosses of the infection
Point system
When the infected kill something, evolve, or create more of themselves they gain points with certain threshold it will increase the phase
phase 0 before the infection start no infected spawn you cannot go back to phase 0
phase 1 will trigger after the meteorite crashes on spawn swarmers will naturally spawn
phase 2 more swarmers spawn amalgamated start to spawn naturally leaders have a chance to spawn instead of a normal variant
phase 3 some infected gain permanent effects grown start to spawn
phase 4 gained permanent effects are stronger Overgrown start to spawn naturally Nodes may start to spawn after overgrown kills enough mobs
phase 5 even stronger gained effects nodes start to spawn really rarely there must be an 800 block distance from another node to spawn another node from overgrown kills
phase 6 nodes can now start spawning leviathans
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.20.1
- 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 CurseForge — 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.
- Ships as swarm_infection-1.3.2-forge.jar — drop this file into the mods folder
- Download size: 632 KB
- Download link checked 27 Sept 2026 — working
These come from our own check of the pack file, not from the source page.