Fog Cloud

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