Chill Touch

You create a ghostly, skeletal hand in the space of a creature within range.
Make a ranged spell attack.
On a hit, the target takes 1d8 necrotic damage, and it can't regain hit points until the start of your next turn.
If you hit an undead target, it has disadvantage on attack rolls against you until the end of
your next turn.
2d8 (5th), 3d8 (11th), 4d8 (17th).