Returns whether the specified player has a boss bar set. If no player is given it defaults to the running player.
Removes the boss bar from the given player. If no player is given it defaults to the running player.
Sets the health of the boss bar for the given player. If no player is given it defaults to the running player. Percent should be between 0-100
Sets a boss bar with a message for the given player. If no player is given it defaults to the running player. Percent can be set to specify how much to fill up the bar from 0 - 100.
Sets a boss bar with a message for the given player. If no player is given it defaults to the running player. Seconds will show the message for that many seconds with the bar decreasing as the time runs out.