The Staff of Serapis is the sequel to The Son of Sobek and the second book in the Percy Jackson and the Olympians/The Kane Chronicles crossover series.

On April 5, 2016, it was released as the second of three short stories in a hardcover novel entitled Demigods and Magicians: Percy and Annabeth Meet the Kanes.

Sadie Kane arrives, scares the beast off with some spells, and helps Annabeth recover from its poisonous aura.

Annabeth and Sadie introduce themselves, and, deciding that another monster with only a dog head must be connected to the first beast, team up.

The two attempt to explain their worlds as they track down a god Annabeth remembers having something to do with the conglomerate monster they have encountered.