Death From The Heavens

You beckon the unadulterated power of the gods and summon them to rain hell upon your foes, causing dark clouds to roll in to cover a 500-foot-radius circle centered on a point you can see within range. At the start of each of your turns for the duration, piercing light breaks through from above the clouds towards up to three different points of your choice beneath the clouds. Each creature in a 15-foot-radius sphere centered on each point must make a DEX saving throw, taking 13d6 force damage on a failed save or half as much on a success.