Enchanting Grom Fright

Luz learns that Hexside has its own version of Prom called Grom. Amity is selected as Grom Queen, which upsets her. Luz learns that on Grom, one student is chosen to fight the shape-shifting fear demon Grometheus, who lives under Hexside. Luz steps up to replace Amity as Grom Queen. Meanwhile, Gus invites King to be his co-emcee at Grom, but he is revealed to have stage fright. Once at Grom, Luz begins battling Grometheus, who takes on the appearance of her biggest 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. Amity steps in to help Luz, and Amity's biggest fear is revealed to be rejection from somebody she was too afraid to ask to Grom. Luz and Amity defeat Grometheus together via dance-fight, and are carried by the students back to the party as Co-Grom Queens. Amity's Grom letter is shown to be addressed to Luz. Back home, Luz, who has been avoiding texting her mother, finds the courage to text her back. Back in the human world, it is shown someone is impersonating Luz and sending letters to her mother. (Source: Wikipedia)