Warrior of the Gods

A divine power sustains you in battle. You have a pool of four d12s that you can expend to heal yourself. As a Bonus Action, expend any number of available dice, roll them, and regain Hit Points equal to the total rolled.

You regain all expended dice when you finish a Long Rest. Your pool increases to five dice at Barbarian level 6, six dice at Barbarian level 12, and seven dice at Barbarian level 17.