When the heroes learn that Luke can breach Camp Half-Blood’s security through an exit from Daedalus’s Labyrinth, they enter the maze in search of the inventor and a way to stop the invasion.

After that, there are two more books in the original series, The Battle of the Labyrinth and The Last Olympian, though Riordan has continued Percy's story through additional novels. While ...

The ultimate goal of the labyrinth is to face off against Emperor Izaro, himself. This boss battle will take place across three different phases, each of which will differ on a given day.