Eldritch Bombardment

You fire an eldritch blast into the air and choose any point that you can see. Hundreds of eldritch blasts fall in a bombardment from above.Each creature in a 50-foot-radius centered on that point must make a Dexterity saving throw or take 5d6 force damage, as well as an additional 5d6 fire or radiant damage (your choice), and be knocked prone. A creature that succeeds on its saving throw takes half as much damage and isn’t knocked prone. Buildings and other structures take double damage from the bombardment.