Acid Fog

You select a point you can see in range. A cloud of acid forms and affects all creatures and objects within 30 feet of the point you selected. Any creature that starts its turn within the acidic cloud must make a constitution saving throw. A creature that fails takes 2d8 acid damage or half as much on a successful saving throw. Creatures that breathe the acid take double the acid damage. Objects within the cloud take 2d8 acid damage every round. After the duration the cloud dissipates harmlessly.

This spell conjures a natural effect of such acid. After the spell is completed the effect is considered a natural phenomena and dispel magic and anti magic fields will not work on it.