Fog Cloud

Casting Time: 1 action
Range: 120 fee
Duration: Concentration, up to 1 hour
You create a 20-foot-radius sphere of fog
centered on a point within range. The sphere
spreads around corners, and its area is heavily obscured. It lasts for the duration or until a wind
of moderate or greater speed (at least 10 miles
per hour) disperses it.
See PHB, pg. 243.