Thousand Splinters

Explode sharpened bone shards across a 60-ft. radius sphere centered on a point within range. Creatures of your choice in the area must make a DEX save, taking 88 (16d10) piercing damage on a failed save, or half as much on a success. A creature that fails the save is also impaled by bone fragments; until the end of its next turn, its speed is halved and it cannot regain hit points.