Touch of Undeath

Your hand becomes enshrouded by a dark cloud that causes damage to any living creature it touches. Make an attack against the creature to assail it with pure necrotic energy. This attack can be turned into a concentration-based grapple. On a hit, the target takes 1d8 necrotic damage, and it can't regain hit points until the start of your next turn. As a grapple, the hand clings to the target.

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 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).