Wall of Fire

You create a wall of fire on a solid surface within range. It can be up to 60 feet long, 20 feet high, and 1 foot thick, or a 20-foot-diameter, 20-foot-high ringed wall. The wall is opaque and lasts for the duration. One side of the wall (your choice) deals 5d8 fire damage to each creature that ends its turn within 10 feet of that side or inside the wall. A creature takes the same damage when it enters the wall for the first time on a turn. The other side of the wall deals no damage.