Wall of Smoke

A thin veil of magic smoke appears at a point you choose within range, forming a wall. You can make the wall up to 30 feet long, 10 feet high, and 1 foot thick. The wall blocks line of sight but not movement, and vanishes when the spell ends. The wall does no damage but creatures in the wall or pass through the wall must make a Constitution saving throw. On a fail save the creature is blinded till the end of your turn. On a successful save, the creature is immunes to the spell for 24 hours. 

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you can choose 1 creature with in range for each slot above 1st level. A chosen creature can see through the wall normally and is immune to its effects.