Fire Storm

A storm made up of roaring flame appears. The
area of the storm consists of up to ten 10 ft
cubes, which you can arrange as you wish. Each
cube must be next to one other cube. Each
creature in the area makes a Dex save. It takes
7d10 fire damage on a failure, or half as much
damage on a success.
The fire damages objects in the area and ignites
flammable objects. If you choose, plant life in the
area is unaffected by this spell.