Crusalis FoF
by turgangs
Crusalis FoF colors other players' hitboxes green, orange or red so a client can read their diplomatic standing at a glance.
What it does
The Fabric mod is a client-side tool built around the Crusalis diplomacy system. When a player's hitbox is shown through the F3+B debug view, its color follows that player's relation to the viewer: allied nations and friendly players appear green, neutral or unknown players appear orange, and enemies, including every member of an enemy nation, appear red. Only the client needs the mod, so players join servers without installing anything on the server side.
Targeting is limited to the player in the crosshair, and the coloring reaches up to 256 blocks away, so scouting and ranged fights stay readable without clutter. The mod reads relationship tags published by the server, and server administrators can switch its features off for connected clients through a chat command. It needs Cloth Config API, Fabric API and Mod Menu, with the optional Crusalis Cappinger addon. Files target 1.21.7 – 1.21.11, and the latest build is 1.2.0 for 1.21.11, released under All rights reserved.
Key features
Relationship coloring
Hitboxes change color to show whether a player is an ally, a neutral or an enemy.
Nation-based marking
Players from allied nations, enemy nations and unknown groups are each marked with their own color.
Targeted coloring
Only the player under the crosshair is colored, which keeps the rest of the screen clean.
Server-controlled features
Server administrators can disable the mod's features for connected clients through a chat command.
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 3
Optional 1
Use cases
Organized events
Event hosts can use the coloring to tell participating factions apart during structured play.
Ranged combat
The 256-block detection range helps players spot enemies before they enter close combat.
Who it’s for: Players and groups on Fabric servers that use the Crusalis nation and diplomacy system, and server owners who run balance tests or organized events.
How it compares
Only Elytra Hitbox is client-side only, under the CC0 1.0 Universal license, and not open source, with Fabric files for 1.21.1 – 1.21.11, so it covers a wider version span. No Friendly Fire is client-side only, under the MIT License, not open source, and built for 1.21.11 alone. Hitbox Reveal is also client-side only and open source under the MIT License, but only for 1.21.11.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Crusalis FoF | Fabric | 1.21.7 – 1.21.11 | Client-side only | 2026-06-25 |
| Only Elytra Hitbox | Fabric | 1.21.1 – 1.21.11 | Client-side only | 2025-12-29 |
| No Friendly Fire | Fabric | 1.21.11 | Client-side only | 2026-03-21 |
| Hitbox Reveal | Fabric | 1.21.11 | Client-side only | 2026-09-11 |
Questions
Does Crusalis FoF need to be installed on the server?
Which dependencies does Crusalis FoF require?
Which game versions are supported?
In the catalog
Crusalis FoF is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from turgangs
Similar mods
What the author says
A lightweight, client-side Fabric mod that instantly identifies player allegiances by coloring their hitboxes based on your nation's relationship with them. Works out of the box. Just install and play. No setup required.
Official listing
- Modrinth page
- modrinth.com/mod/crusalis-fof
- Owner
- turgangs
- Published
- 2025-12-30
- Updated on Modrinth
- 2026-06-25
- Facts verified
- 2026-10-15