Ashen Fog

You create a 20-foot-radius sphere of black ashen 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. The ashen dust sears the eyes and lungs of enemies trapped within, but spares the breath of allies. Enemies within the fog are distracted, and must make a CON save at the start of each turn they are within the cloud. If an enemy fails their CON save, they are blinded until the start of their next turn.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the radius of the fog increases by 20 feet for each slot level above 2nd.