Eldritch Evocation - Aberrant Jaw

Your fanged maw is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to 1d6 + your Strength or Charisma modifier, instead of the bludgeoning damage normal for an unarmed strike. While you are missing half or more of your hit points, you have advantage on attack rolls you make with this bite. This attack is considered magical for the purpose of overcoming resistances.

In addition as a bonus action, you can make a special attack with your bite. When you attack with this bite and hit a creature that isn’t a Construct or an Undead, you can empower yourself in one of the following ways of your choice: You can empower yourself with this bite a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

• You regain hit points equal to the piercing damage dealt by the bite.
• You gain a bonus to the next ability check or attack roll you make; the bonus equals the piercing damage dealt by the bite.