Block Contagion
by BeanInBag
Block Contagion is a Fabric mod in which a placed block starts a viral spread that converts neighboring terrain, and a player can stop it by breaking the source block.
What it does
Once a source block is placed, the infection spreads outward in waves and turns surrounding dirt, stone and hills into the same block. The spread continues until the original block is broken, so removing that single source ends the growth. Blocks already converted can be mined freely without halting the spread, which keeps cleanup simple.
The mod suits players who want a destructive, world-altering experiment in single-player or on a multiplayer server. Installation covers the server and each player's game. Files are published for Fabric only, covering 1.21.1 – 1.21.11, and the code is released under the MIT License, so the mod is not open source.
Key features
Infect with a block
Players place a chosen block to start a contagion that spreads across nearby terrain.
Relentless spread
The converted area grows in expanding waves, taking over neighboring dirt, stone and hills block by block.
Source neutralization
Breaking the original source block stops further spread, while converted blocks remain and can be mined.
Immersive effects
Footstep dust puffs appear quietly while the infection spreads, and the effect ends once the source is broken.
Toggle command
A virus toggle switches between normal building and virus mode at any time.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Terrain reshaping
Players can seed a spreading infection into an existing map to reshape its landscape.
Who it’s for: Players who want a terrain-changing mechanic in a survival or creative world, and server owners who want to offer the infection on a multiplayer server.
Questions
Does Block Contagion need to be installed on the server?
How is the spread stopped?
Which game versions does Block Contagion support?
In the catalog
Block Contagion is one of 7,555 Cursed mods on ModsFinder, and one of 4,235 Cursed mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from BeanInBag
Similar mods
What the author says
Block Contagion turns any block you craft, find, or place into a creeping viral infection that spreads across the terrain until its source is broken! Infect With Any Block: Place TNT, Diamond Blocks, Obsidian, Gold, or literally any block you grab from creative or find in the wild. Relentless Spread: Watch as…
Official listing
- Modrinth page
- modrinth.com/mod/block-contagion
- Owner
- BeanInBag
- Published
- 2026-09-06
- Updated on Modrinth
- 2026-09-06
- Facts verified
- 2026-10-15