He is next seen being dragged into Daedalus' workshop by one empousa and two Laistrygonians, in chains, after being tricked by King Minos. He escapes with Percy, Annabeth, and Rachel Elizabeth Dare, who have to go back into the Labyrinth to find Grover and Tyson, who had stayed behind to look for Pan, god of the Wild. Along the way, they see Kronos in the form of Luke, and Nico, in a desperate attempt to save everyone, shows his true powers, and makes it known to Kronos that he is a son of Hades. They meet the wild god Pan, who gives everyone except for Nico a cryptic future reading and then vanishes. After they get out of the Labyrinth, a full-fledged battle erupts between the Titans and Camp Half-Blood, in which Nico summons a dozen undead soldiers to fight the dracanae, passing out in the process. He is revived with nectar and ambrosia, and he states that summoning that many soldiers required a lot of energy. After the campfire, he is seen talking with the ghost of his sister Bianca. He then tells Percy, who came out to see what was going on, that he did not belong at camp, but instead in the Underworld; he would train there instead. He also goes to search for his mother. He is last seen on Percy's apartment fire escape giving Percy news on Daedalus and a way to beat Luke for good. Before mentioning it, Nico is distracted by Percy's blue birthday cake, and Percy invites him in to talk.