Gift of the Shadow Dragon

You’ve manifested some of the power of shadow dragons, granting you the following benefits:

Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.

Shadow Infusion. As a bonus action, you can infuse a melee attack with negative energy. The weapon deals an additional 2d6 necrotic damage, and you regain hit points equal to half the amount of necrotic damage dealt.   You can use this bonus attack a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.