Fog Cloud

Casting Time: 1 action; Range: 120 feet
Duration: Concentration, up to 1 hour
You create a 20-foot-radius 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. Cast using a spell slot of 2nd level or higher, the radius of the fog increases by 20 feet for each slot level above 1st.