However, because they only have three pearls, Grover remains with Persephone to allow Percy's mother to leave. Percy, Annabeth, and Sally teleport to the Empire State Building but are attacked by Luke, who wants to destroy Mount Olympus to secure the demigods' place as the new rulers of the gods. After a fight across Manhattan, Percy defeats Luke and returns the lightning bolt to Zeus, who forgives Percy and allows Poseidon to briefly speak with his son.