Drawing on the deepest fears of a group of creatures, you create a dome of illusionary darkness. Within this darkness, swarms of insects and other tiny creatures crawl over the victims.  Each creature in a 30-foot-radius sphere centered on a point of your choice within range must make a Wisdom saving throw. On a failed save, a creature becomes frightened and blinded for the duration. The illusion calls on the creature's deepest fears, manifesting small beings that torment them to the point of mental anguish. At the end of each of the frightened creature's turns, it must succeed on a Wisdom saving throw or take 11d6 psychic damage. On a successful save, the spell ends for that creature.