You summon a towering illusion of unspeakable horror in a 30-foot-radius sphere centered on a point you choose within range. Creatures of your choice in the area must make a Wisdom saving throw. On a failed save, creatures are paralyzed with fear until the end of their next turn. On a successful save, creatures are frightened for 1 minute. The illusion is semi-corporeal, and creatures frightened or paralyzed by it take 4d10 psychic damage at the start of their turns. You can move the illusion up to 20 feet as a bonus action, forcing affected creatures to repeat the saving throw if it ends its turn within 10 feet of the illusion.