Swirling Rubble

Clods of dirt and stone raise from the ground and swirl within a 10 foot radius around you for the duration. When a hostile creature enters the area for the first time on a turn or starts its turn there, it takes 1d10 bludgeoning damage. 
As a bonus action on each of your turns while you are concentrating on this spell, you may fling a piece of debris at a creature or object within 30 feet of you. When you do so, make a ranged spell attack. On a hit, the target takes 2d10 bludgeoning damage.