You hurl a small boulder at a creature within range, or drop it from above if you are at least 30 feet above the creature. The creature must make a Dexterity saving throw, taking 6d6 bludgeoning damage on a failed save, or half as much damage on a successful one.   In addition, the force of the boulder's impact creates a shockwave that ripples outward from the point of impact. Each creature within 15 feet of the target must make a Constitution saving throw. On a failed save, a creature takes 4d6 thunder damage and is pushed 10 feet away from the point of impact. On a successful save, the creature takes half as much damage and isn’t pushed.