Ash Cloud

You create a 20-foot-radius sphere of burning ash 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. A creature who breathes in the ash takes 3d4 fire damage on a failed Con. save, half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the radius of the ash increases by 20 feet and the damage increases by 2d4 for each slot level above 1st.