Contagious Effects
by Inchutter
Contagious Effects lets status effects spread from one player to nearby players in multiplayer, within a configurable range.
What it does
Standing near other players, someone who has a status effect may hand it over, and each nearby player then gets a chance to catch that same effect. The transfer happens only within a set distance, so the effect works as a proximity-based interaction rather than a global one. Spread checks run at a set interval, and a cooldown stops the same player from being hit again and again.
The mod runs on the client and on the server, so the server and every player need it installed. It is published for Fabric only, with a single build, 1.0.0 for 1.21.11, released on 2026-02-02. The code is covered by the MIT License, and the project is not open source in the sense of publishing the source publicly under that license. Cloth Config API and Mod Menu are optional: with them installed, the settings can be adjusted in game.
Key features
Configurable spread range
The distance at which effects can transfer is set in the config, with a default of 2 blocks.
Spread interval and cooldown
A check interval, default 10 ticks, controls how often transfers are tested, and a cooldown prevents constant re-application.
Smart overwriting
An option lets an incoming effect replace an existing one only when it is stronger or longer-lasting.
Player state filtering
Spectators and creative mode players are excluded from both spreading and receiving effects.
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.
Optional 2
Use cases
Multiplayer groups
Groups on a shared server can make potion effects like regeneration or speed move between members who stay near each other.
Adventure maps
Map makers can use proximity-based effect transfer as a mechanic when players travel together through a scenario.
Who it’s for: Server owners and players who want potion effects to pass between nearby players in multiplayer. Because the mod must run on both sides, it fits servers that can install it for every participant.
How it compares
Bad Grass, No Spread is a Fabric and NeoForge mod for 1.21.11, client and server, under the MIT License, and it is open source. Random Kill Effects is server-side only, released under the MIT License for 1.21.8 – 26.1.2, and is not open source, so players can join without installing it. Better Beacon Range is also server-side only and open source under the GNU General Public License v3.0 only, for 1.21.4 – 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Contagious Effects | Fabric | 1.21.11 | Client and server | 2026-02-02 |
| Bad Grass, No Spread | Fabric and NeoForge | 1.21.11 | Client and server | 2026-03-23 |
| Random Kill Effects | Fabric | 1.21.8 – 26.1.2 | Server-side only | 2026-09-20 |
| Better Beacon Range | Fabric | 1.21.4 – 1.21.11 | Server-side only | 2026-01-20 |
Questions
Does Contagious Effects need Cloth Config API or Mod Menu?
Does a player need the mod to receive effects?
Which game version does Contagious Effects support?
In the catalog
Contagious Effects is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from Inchutter
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What the author says
A Minecraft Fabric mod that enables status effects to spread between nearby players. Contagious Effects adds a new layer of interaction to multiplayer Minecraft by allowing potion effects to propagate between players within a configurable range. When a player carries a status effect, nearby players have a chance to…
Official listing
- Modrinth page
- modrinth.com/mod/contagious-effects
- Owner
- Inchutter
- Published
- 2026-02-02
- Updated on Modrinth
- 2026-02-02
- Facts verified
- 2026-10-15