Java 26.2
Bossbar
nbtforge:boss
Add
NBTForge Boss
/bossbar add nbtforge:boss {text:"NBTForge Boss",color:"red"}A boss bar is a persistent world object with an id, so the create, set, get and remove commands all have to agree on that id. Build each one here, including the text-component name, and keep the identifier consistent across your command pack.
Boss bar control
Java 26.2
Add
NBTForge Boss
/bossbar add nbtforge:boss {text:"NBTForge Boss",color:"red"}