Event Horizon

You twist the edges of space around a target location within range, stunning enemies who pass through the perimeter. You summon a ringed wall 15 feet in diameter, 10 feet high, and 5 foot thick. The wall vanishes at the end of your next turn. When the wall appears, each creature within its area must make a Dexterity saving throw or become stunned until the end of its next turn. When a creature enters the wall for the first time on a turn or ends its turn there it must make a Wisdom saving throw or become stunned until the end of its next turn. Once a creature has been stunned by this spell they become immune to this casting of the spell effects,.