Erden's Ultimate Fireball

You eyes burn with harmless flames as a bright streak flashes from your outstretched hands to a point you choose within range that then blossoms with a loud roar into an explosion of flame. Each creature in a 50 foot sphere centered on that point must make a Dexterity saving throw DC 20. A target takes 10d10 fire damage on a failed save, or half as much damage on a successful one.

The fire spreads around corners and it's heat can be felt through nearby walls. It ignites any flammable objects in the area and can melt through the strongest of materials.