Venfiel's Wall of Cloud

You conjure a magical wall of cloud that is solid to the touch. The wall itself is one foot thick and completely obscures objects behind it. You can make the wall up to 60 feet long, and 20 feet high or a ringed wall up to 20 feet in diameter and 1 foot thick. If the wall appears in a creature's space, the creature must succeed on a dexterity saving throw. On a failed save, the creature takes 6d8 force damage or half as much on a successful save. On a failed save, the creature is pushed back 10 feet. One side of the wall, selected by you upon casting, deals 6d8 force damage to any creature within 10 feet of the wall, or within the wall.