Sandstorm

You manipulate sand to become a storm that engulfs an immense area. Choose a point you can see within range of the spell. The storm begins at the chosen point, with a 50-foot radius and 100 feet of height. In addition, the area becomes difficult terrain, and you can move the storm 15 feet on each of your turns.

Enemies in that area must make a Constitution saving throw the moment the spell is cast and at the start of each of their turns while within the area. On a failure, an affected creature takes 3d6 disruptive damage. Enemies within one of these storms must hold their breath to avoid suffocating.

At Higher Levels. When you cast this spell by spending Mana points equal to an 8th-level spell or higher, the disruptive damage increases by 1d4 for each spell level above 7th.