Draconian Claws

You grow claws from your draconic heritage. Make a melee spell attack against the target. On hit, the target takes 1d6 slashing and 1d8 damage associated with your draconic bloodline.

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8). The slashing damage does not increase.