It was a normal day at Camp Half-Blood. Percy Jackson, Annabeth Chase, Nico di Angelo, Leo Valdez, Will Solace, Jason Grace, Hazel Levesque, Frank Zhang, Piper McLean, and Chiron, the camp's immortal centaur were all gathered by the lake. All of the camp's campers were enjoying the sunshine as they relaxed by the lake.

Suddenly, a portal opened, and out of it, a young, scruffy demigod emerged, stumbling out and falling face first on the mud