Effective Instruments adds an aura system to musical instrument mods (Genshin Instruments, Even More Instruments, Immersive Melodies). While you play, nearby allies receive effects from your chosen aura, or swap to offensive to debuff every mob in range.
![Immersive Melodies [Fabric/Forge] logo](https://media.forgecdn.net/avatars/867/344/638280636660476412.png)