The Battle of the Labyrinth camp for the school year. On his fifteenth birthday at the summer's end, Percy receives a visit from his father Poseidon, who gives him a sand dollar, admonishing him to “spend it wisely”. Nico later appears to tell Percy his plan to defeat Luke once and for all. "The Battle of the Labyrinth" was initially referred to as "Percy 4" until the title was officially revealed. The novel was teased by Rick Riordan behind the pages of its predecessor, "The Titan's Curse". It was based on the Greek myth of the labyrinth, where the Minotaur was supposedly kept. In his
Daedalus convince Minos to take a bath first, where Cocalus' daughters killed Minos. In some versions, Daedalus himself poured boiling water on Minos and killed him. The anecdotes are literary and late; however, in the founding tales of the Greek colony of Gela, founded in the 680s on the southwest coast of Sicily, a tradition was preserved that the Greeks had seized cult images wrought by Daedalus from their local predecessors, the Sicani. Daedalus was so proud of his achievements that he could not bear the idea of a rival. His sister had placed her son, named variously as Perdix, Talos,