Cosmo's Cosmic Comet

You point at a location you can see within range. A blazing comet shoots from your finger and lands in a giant blast. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 4d6 force and 4d6 thunder damage on a failed save, or half as much damage on a successful one.

The blast spreads around corners. Objects in the area that aren't being worn or carried take max damage.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd. This starts with force and alternates each level with thunder.