Corosive Whiplash

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 10 feet of you. On a hit, the target suffers the weapon attack’s normal effects, if the target is more than 5 feet away it also takes 1d4 Acid damage. 

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d4 Acid damage to the target on a hit, and the damage the target takes if it is more than 5 feet away increases to 2d4. Both damage rolls increase by 1d4 at 11th level (2d4 and 3d4) and again at 17th level (3d4 and 4d4).