Wall of Fire

You raise a blazing wall that burns creatures passing through it. You create either a 5-foot-thick wall of flame in a straight line up to 60 feet long and 10 feet high, or a 5-foot-thick, 10-foot-radius ring of flame with the same height. The wall stands vertically in either form; if you wish, the wall can be of a shorter length or height. Everything on each side of the wall is Concealed from creatures on the opposite side. Any creature that crosses the wall or is occupying the wall's area at the start of its turn takes 4d6 fire damage. Heightened (+1) The fire damage increases by 1d6.