Death Claw

You channel negative magic to cause your fingers to elongate into shadowy claws. Make a melee spell attack against the target. On a hit, the target takes 1d10 necrotic damage. After you make the attack, your fingers return to normal.

The spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).