Vicious feast

You relish in the taste of battle. You gain the following benefits: Increase your Strength or Dexterity score by 1, up to a maximum of 20. When you make an unarmed strike with your Bite attack or reduce a creature to 0 hit points, you can spend one Hit Dice to heal yourself. Roll the die, add your Constitution modifier, and regain a number of hit points equal to the total (minimum of 1).