Worldstone Cataclysm

The earth convulses in a 60-ft. radius centered on a point within range. Creatures of your choice in the area must make a DEX save, taking 88 (16d10) bludgeoning damage on a failed save, or half as much on a success. On a failed save, a creature is knocked prone, restrained by rubble until the end of its next turn, and the area becomes difficult terrain.