Blaze's Flaming Blanket

You focus on a location within range, and a 10-foot-radius, flaming wall of fire falls from the sky onto the area igniting anything it touches. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 6d6 fire damage and is set on fire. At the end of a person's turn if they're still on fire they take an extra 1d10 fire damage or can use an action to put it out. On a successful save, a creature takes half the initial damage and no damage at the end of its next turn.

The fire damages objects in the area and ignites flammable objects that aren't being worn or carried. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the initial damage increases by 2d6 for each slot level above 4th.