Blorbo's Double Fireball

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into a lot of flame. Every creature in a 40ft radius sphere must make a Dexterity saving throw or take 12d6 fire damage, or half as much on a success.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.