Swarm Infection
by Clock_Jamers
Swarm Infection is a Forge mob mod for 1.20.1 in which an alien swarm lands on Earth, infects wildlife and grows through several phases of difficulty.
What it does
The mod adds an alien species that arrives in an Infection Swarm meteorite and drops onto the surface. Swarmers attack living creatures, dissolve their flesh and merge with the biomass. A victim can become an Amalgamated mob, which evolves into stronger variants, and each evolved form can create more swarmers. A point system tracks the infection and rises with the actions taken, moving the world through higher phases with higher difficulty.
Phase 0 is the state before any infection starts, and once the infection begins the world cannot return to it. Later phases bring more swarmers, Amalgamated leaders that spawn in place of normal variants, infected mobs with permanent effects, and Overgrown mobs that spawn after enough kills. Biomass spreads across the ground and grants Infection potion effects, and large nodes of biomass can form constructs that destroy everything in their path. Geckolib is required for the mod to run.
The mod is client and server, so the server and every player need it. It is published for Forge only, on 1.20.1, with version 1.3.2 as the latest file, released under the MIT License and not open source.
Key features
Meteorite-born swarmers
Infection Swarm meteorites drop alien swarmers onto the surface, which begin attacking wildlife nearby.
Assimilation of mobs
Swarmers attach to victims, dissolve their flesh and merge with them, producing Amalgamated mobs.
Evolving variants
Amalgamated mobs evolve into stronger forms with new abilities and attributes as they kill enough mobs.
Phased infection
A point system advances the world through six phases, each adding spawns, effects and tougher threats.
Biomass nodes and leviathans
Biomass nodes spread across the map, and in the latest phase they begin to spawn leviathans.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
SCP-149, The Blood Flies is a Forge mod for 1.19.2 – 1.20.1, with client and server support, released under All rights reserved and not open source. TFTH is a Forge mod for 1.20.1 only, also client and server, under a custom license and not open source. Strange infection supports both Fabric and Forge across 1.20.1 – 1.21.8, while Spider Infection is server-side only, published for Forge and NeoForge across 1.20.1 – 1.21.5.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Swarm Infection | Forge | 1.20.1 | Client and server | 2024-10-22 |
| SCP-149, The Blood Flies | Forge | 1.19.2 – 1.20.1 | Client and server | 2026-06-10 |
| TFTH | Forge | 1.20.1 | Client and server | 2024-04-04 |
| Strange infection | Fabric and Forge | 1.20.1 – 1.21.8 | Client and server | 2026-10-11 |
| Spider Infection | Forge and NeoForge | 1.20.1 – 1.21.5 | Server-side only | 2025-05-30 |
Questions
Does Swarm Infection need Geckolib?
Does the server need Swarm Infection installed?
Which Minecraft version does Swarm Infection support?
In the catalog
Swarm Infection is one of 11,058 Mobs mods on ModsFinder, and one of 6,527 Mobs mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from Clock_Jamers
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What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/swarm-infection
- Owner
- Clock_Jamers
- Published
- 2024-09-30
- Updated on Modrinth
- 2024-10-22
- Facts verified
- 2026-10-15