Distant Inferno

A bright flash blossoms from yourself with a booming roar into an explosion of flame. Each creature in a 400-foot-radius sphere centered on self must make a Dexterity saving throw. A target takes 9d6 fire damage on a failed save, or half as much damage on a successful one.

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

Ritual form increases radius to 1400 ft

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.