They climb the staircase and accidentally discover a secret door leading into the paymaster's office. The fourth door leads to a sloping tunnel and a cavern where the Monks of Mirth are celebrating the Festival of Laughter. One is placed on Number Ten Ox's back and starts to squeeze his neck. The monks are revealed as living corpses and the one on his back is the Laughing Prince. He manages to oil the corpse and squeeze it off. He hacks it to pieces with an axe, but the pieces continue to speak and move. Finally he lights it with a torch and the monks cease to move. Master Li recovers the Stone from the Laughing Prince, where it had revitalized his corpse after his death.