Conflagration

You evoke the flames of a burning forest on any solid surface for the duration. You create a blazing forest complete with ashen trees and underbrush up to 45 feet long, 45 feet wide, and 10 feet tall.

When the blazing brush appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 6d8 fire damage, or half as much damage on a successful save.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d8 for each slot level above 6th.