The vargouille unleashes a piercing shriek. Creatures within 30 feet of the vargouille that hear the shriek must succeed on a DC 12 Wisdom saving throw or be frightened and stunned until the end of the vargouille's next turn. While frightened in this way, a target is stunned. If the creature's saving throw is successful, then it is immune to the vargouille's shrieks for the next hour.