Vampiric Scratch

You create a ghostly, skeletal hand in the space of a creature within range. He makes a ranged spell attack against the creature to attack it with the tomb's chill. If hit, the target takes 1d4 necrotic damage and you gain the same amount in temporary hit points.

 If you hit an undead target, it also has disadvantage on attack rolls against you until the end of your next turn.

 This spell's damage increases by 1d4 when you reach 5th level (2d4), 9th level (3d4), 13th level (4d4), and 17th level (5d4).