Volcanic Ash Cloud

You create a 20-foot-radius sphere of volcanic ash centered on a point within range. The sphere spreads around corners, and its area is heavily obscured. The spell lasts for 2 rounds or until cleared by wind.

At Higher Levels. 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.