Toxic Cloyd

You create a 20-foot-radius sphere of toxic gas centered on a point within range. The sphere spreads around corners, and its area is heavily obscured. Any creature that ends a turn inside the fog must make a Constitution saving throw and take 3D4 poison damage on a failed throw, or half as much on a successful one. It lasts for the duration or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.

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 and the damage increases by 1D4 for each slot level above 1st.