Cloud of Set

The spell produces a cloud of dust that only the caster can see through. The cloud has a 20 ft. radius and can be centered on any point within range. The cloud lasts 1 minute or until dispelled using a free action. Any creatures within the cloud must make a Constitution saving throw or become blinded. Creatures can make the saving throw again at the beginning of their turn until the effect is dispelled and then they are immune to the cloud until it is cast again.