Fog cloud

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.
At higher level
When you cast this spell using a spell slot of
2nd level or higher, the radius of the fog
increases by 20 feet for each slot level above 1st.