You create a 5-foot-diameter sphere of moonrock that slams down on a point you can see within range. Each creature within 5 feet of that point must make a Dexterity saving throw. On a failed save, a creature takes 2d8 bludgeoning damage and 2d8 radiant damage and is knocked prone. On a successful save, a creature takes half the damage and isn’t knocked prone.    Until the spell ends, you can use a bonus action on each of your subsequent turns to cause the moonrock to appear and slam down on a point you can see within range again.