Espen's Bearing Barrage

Three ball bearings are tossed into the air and enlarge to the size of cannonballs that can move 30 feet each round. each Bearing can be commanded to attack a target during its movement. On a hit the target takes 1d10 bludgeoning per ball bearing that targeted it. The ball bearings can be commanded on subsequent turns with a bonus action. If a ball bearing leaves the range of the spell, or if the spell ends by loss of concentration the bearing flys off and shrinks back to its original size. At higher levels the spell create one additional ball bearing for each level over third.