Brimstone Firewall

A 50ft. Cube of fire forms around a creature you can see within range becomes its center. Blazing skull-shaped orbs of Brimstone Flames shoot at four different points you can see within range. Each creature in a 50-foot-radius Cube centered on each point you choose must make a Dexterity saving throw. A creature takes 12d8+WIS Brimstone-Flame damage and 20d6+WIS on a failed save or half as much on a successful one. A creature in the area of more then one Brimstone orb is only effected once. 

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