Windbrace

You create a 5 foot square surface of solidified air within range that remains stationary in the air at whatever position it was created in. The square is nearly invisible, is as hard as stone, and requires a perception or investigation check of 18 to spot. A small or crouching medium creature can use the square for partial cover. The square can support a single medium creature standing on it, but more will dispel it. Casting this spell again dispels the previous casting.