Wall of Steam

You cause a wall of scalding steam to erupt within range.  You can make the wall up to 40 feet long, 20 feet high, and 5 feet thick, or you can make a ringed wall up to 20 feet in
diameter, 10 feet high, and 5 feet thick. The area covered by the wall is heavily obscured.
When the wall appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 6d10 fire damage, or half as much damage on a successful save. A creature takes the same damage when it enters the wall for the first time on a turn or ends its turn there.
As a bonus action on each of your turns, you can move the wall 5 feet in any direction. The wall must maintain the original shape you chose when you cast the spell.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 4th.