Comet Storm

Blazing orbs of fire plummet to the ground at three different points you can see within range. Each creature in a 40-foot-radius sphere targeted on each point you choose must make a Dexterity saving throw. On a failed save the creatures all take 10d6 fire damage and 5d6 bludgeoning damage, or half as much damage on a successful save.

The spell damages objects in the area and ignites flammable objects that aren't being worn or carried.

At level 16, 18 and 20 the fire damage of storm increases by 1d6