Creates and updates custom boss bars.
/bossbar add <id> <name> /bossbar set <id> value <value>
| Name | Required | Description |
|---|---|---|
| id | Yes | Bossbar identifier. |
| name | Yes | Display name. |
| value | No | Progress value. |
/bossbar add cb:timer "Timer" /bossbar set cb:timer value 40
/bossbar set to control color, style, and players.Java-only in current editions.