1Leo Valdez and Crew Go To Hogwarts (crossover Harry Potter and Heroes of Olympus) /after BoO. Hecate requests a quest for Leo Valdez to lead, and he takes Nico, Piper, Calypso, Annabeth, Percy, and Jason to Hogwarts with him where they meet an unusual trio consisting of Harry Potter. Hermione Granger, and Ton Weasley, who seem to be suspicious of everything.