Enchanting Grom Fright.Luz learns that Hexside has its own version of Prom called Grom, in which one student is chosen to fight the shape-shifting fear demon Grometheus, who lives under Hexside. Amity is selected as Grom Queen, but Luz, seeing how worried Amity is, steps up to replace her. Meanwhile, Gus invites King to be his co-emcee at Grom, but King is revealed to have stage fright. Once at Grom, Luz begins battling Grometheus, who takes on the appearance of her greatest fear: her mother discovering she lied and never went to camp. While Grometheus chases Luz, King overcomes his fear and directs the students toward the fight...