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Phayriosis Parasite Infection

by Monbox

Players who want a slow-moving outbreak can add Phayriosis Parasite Infection, a Forge mod in which a parasite infestation grows through phases over time.

ForgeClient and serverAll rights reserved1.20.1

What it does

Phayriosis splits its infestation into several phases, and each phase raises the strength of the creatures that spawn and the speed at which they infect blocks. Early on, basic infectors and converted mobs appear in small groups. At higher phases, stronger creatures spawn more often, and the infection eventually reaches the point where it can alter the world. A command reveals the current phase, and an hourglass item lets players change it.

The parasites follow their own logic. Infectors gather in groups of four, and converted mobs in groups of one. Corpses cannot advance a phase on their own; instead they grow into nodes that hatch stronger parasites. Most nodes evolve into perennial parasites, which stay in one place and summon more creatures, and those perennials can defend themselves. Nest beacons and nest networks link these nodes, and a nucleus at the end of the chain starts slowly converting the entire world.

The mod requires Geckolib and Pehkui, and JEI is listed as a requirement as well. Crisis Contract requires Phayriosis Parasite Infection. Primordial reactors can be crafted to permanently clear sections of the infestation, and a config command can turn the phayriosis off. Files are published for Forge only, for 1.20.1, with 0.0.7 as the latest file. Every player and the server need a copy of the mod.

Key features

  1. Phased infestation

    The infection moves through phases that increase over time, bringing stronger creatures and faster block infection.

  2. Parasite evolution

    Corpses and nodes grow into networking nodes, perennial parasites and hiveperennials, while primordial eggs hatch advanced parasites.

  3. Phase commands

    Commands edit the phase and reveal the current one, and an hourglass item provides a quick way to change it.

  4. Primordial reactors

    Crafted reactors permanently kill sections of the phayriosis, and a config command can turn the infection off entirely.

Compatibility

Latest build for each game version and loader.

1.20.10.0.7
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 2

GeckolibA 3D animation library for entities, blocks, items, armor, and more!
Required
PehkuiLets you change the size of most entities, shrinking their scale smaller or growing them larger
Required

Required by 1 mod

How it compares

Full comparison

Phayriosis:Cataclysm is a Forge mod for 1.20.1 – 1.20.6, released under the Apache License 2.0, and it runs on client and server, so it covers a wider version range than this mod. One-Click Parasite Transformation is a Forge mod for 1.20.1 that is server-side only, so players join without installing it, and it is released under the MIT License.

ModLoadersGame versionsEnvironmentUpdated
Phayriosis Parasite InfectionForge1.20.1Client and server2026-10-10
Phayriosis:CataclysmForge1.20.1 – 1.20.6Client and server2026-09-22
One-Click Parasite TransformationForge1.20.1Server-side only2025-11-23

Questions

Does Phayriosis Parasite Infection need Geckolib?

Yes. Geckolib is a required dependency, and Pehkui is required as well. Both must be installed next to the mod.

Does the server need the mod?

Yes. Installation covers the server and each player's game.

Can the infection be stopped?

Primordial reactors permanently kill sections of the phayriosis, and a config command can turn it off.

What the author says

although it will probably auto install them upon downloading:/ Phayriosis is split into multiple phases, the phase will increase over time. The higher the phase, the more powerful creatures spawn and the more they infect, eventually ending with them being able to infect blocks. There is MUCH more planned for this…
Monbox, on the Modrinth page

Official listing

Owner
Monbox
Published
2026-03-01
Updated on Modrinth
2026-10-10
Facts verified
2026-10-15