Vampiric Bite

You have a natural bite attack that deals 1d4
piercing damage. You add your Constitution
modifier to the attack and damage rolls (instead
of Strength). If you have half or fewer of your hit points, this attack is made with advantage.
Twice per long rest, you can empower this bite
with one of two abilities:
•Regain hit points equal to the piercing damage
dealt.
•Bonus to your next ability check or attack roll
equal to the piercing damage dealt.