Devourer (5e Feat)
From D&D Wiki
Prerequisites: At least 13 Constitution
Food nourishes the body, you know this more than anyone. When you consume the flesh of a dead humanoid, you gain 10 temporary hit points. You can only eat from a single creature once and it takes 1 minute to eat enough to gain this benefit.
Once per round, you can replace an attack made with the Attack action with a bite, which you are proficient in, dealing 1d8+your Strength modifier piercing damage. If you are grappling a creature, this can be done as a bonus action. If you bite a creature twice within 2 turns, they must attempt a DC 8+your Strength modifier+your Proficiency bonus or take 2d8 necrotic damage at the start of their next turn. Creatures gain advantage on this saving throw for every size category above yours.