Elemental Wall

A wall of either Fire, Ice, Wind or stone is created on a solid surface you can see within range. The wall can be up to 60ft long 20 ft high and 1 foot thick. or a ringed wall up to 20 ft in diameter, 20 ft high and 1 foot thick. when the wall appears each creature within it's area must make a DEX saving throw. On a failed save depending on kind of wall is summoned the creature either takes 4d8 fire damage, 4d8 Cold damage and pushed 5 ft back, 4d8 force damage and pushed 10ft back, or 4d8 bludgeoning damage and pushed 5ft back. Half as much on a successful save. With the fire wall one side of the wall selected by you when cast will deal 4d8 fire damage to each creature that ends it's turn within 10ft of that side or inside the wall. a creature takes the same damage when it enters the wall for the first time or ends it's turn there. You can spend a bonus action to change the type of wall that is summoned.