If you are still using Forge for 1.21.4, you will need to switch to Fabric to run this specific .jar file.
When the world appeared, the first thing he noticed was the clarity. Caverns that had once swallowed him in an oppressive fog were revealed in clean, steady light. Shadows softened into dependable edges. Gravel that used to betray him now lay plain and innocuous. His character's torch, still in his hand, was suddenly decorative rather than necessary—an amulet from a different era. File name- Fullbright-Mod-Fabric-1.21.4.jar
Technically, , meaning it does not send modified packets to the server. However, most server anti-cheat plugins (like Anti-Xray or Vulcan) will not flag Fullbright as a cheating mod because it doesn't give you x-ray vision through stone—it only brightens what is already rendered. If you are still using Forge for 1