Cloud of Bewilderment

You create a 20-foot-radius sphere of fog centered on a point within range. Any creature within the fog, must make a Constitution saving throw, or be stunned and blinded for the duration of the spell. If they save, they are just blinded for the duration. Its area is heavily obscured. It lasts for the duration or until a wind of at least 30 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 10 feet for each slot level above 1st.