Vampire's Kiss

The power of your noxious "kiss" can siphon life force from others to serve you. Make a melee spell attack against a creature within your reach. On a hit, the target takes 1d6 necrotic damage, and you gain temporary hit points equal to the amount of necrotic damage dealt.

The damage increases by 1d6 when you reach 5th (2d6), 11th (3d6), and 17th (4d6) level.