Task: Question Generation
Input (English): Passage: In a forest, a group of friends are participating in a LARP when their activities are brought to an end by abusive local police. Their friend Joe, a slacker and a fan of metal music, is dumped by his girlfriend Beth. Joe's friends Eric and Hung bring him unwillingly to a fantasy LARP event to cheer him up. Game master Ronnie, who was once humiliated by Joe as a result of an embarrassing Dungeons & Dragons incident, demands that Eric cast an advanced regeneration spell to allow Joe into the game. Eric recites a random passage from a grimoire he ordered online to allow Joe into the game, and unknowingly summons a succubus which resembles Beth.
Hung teaches Joe the rules of LARP combat, and Joe begins bonding with a female LARPer named Gwen. She is accompanied by her brutish cousin Gunther, who believes that the LARP event is an actual fantasy world and that he is an actual warrior. After the LARP event begins, the succubus begins murdering LARPers, including Hung and their friend Lando, with Ronnie narrowly escaping. Joe, Eric, Gwen, and Gunther discover the aftermath of the killings, and Ronnie informs Eric that the spell he recited was a genuine Enochian spell that can summon demons. They are confronted by the succubus, and Eric recites a different spell to mortally wound the succubus, but instead causes it to transform into a large monster.
Output (English): What does Joe's friend accidentally do when he recites the regeneration spell?