Rage Trait - Endurance

Gain one additional rage slot per Rage Trait. (Max 3)

As a bonus action, use one rage slot to increase your Barbarians' endurance this turn. Gain 5 temp hit points for one round.  5th level, gain 5 temp hit points for 2 rounds  11th level gain 5 temp hit points for 1 minute. 17th level gain 10 temp hit points for 1 minute.