Insatiable Rage of Minauros
Prerequisite: Tiefling, barbarian
Benefit: While you are raging, you gain a +2 bonus on melee damage rolls, but if you end your turn without dealing damage to an enemy on that turn, you take 2 damage.
The bonus increases to +3 and the damage increases to 3 at 11th level. The bonus increases to +5 and the damage increases to 5 at 21st level.
Published in Player's Handbook Races: Tiefling, page(s) 26.