Percy, Piper, Leo, Thalia, Sadie and Walt are betrayed and cheated but with the help of a couple Gods the rise to become the Elmentals and a mysterious band of assassins called the Masked Musicians. They befriend enemies and make enemies out of friends. But what happens when Tarturus is calling ever monster to get revenge for the heroes betrayal

When Grover's "sister" appears after the Giant war questions are asked and prophecies are told. One demigod of very god Roman and Greek are sent to the Harry Potter realm. When she gets pared up with her crush and falls for a wizard she cannot focus. What will become of the quest? How will the Harry Potter characters children react to the unexpected visit? Rated T just in case.