Chiron calls Percy, Annabeth, Thalia, and Nico to the Big House one day to tell them that there are wizards in England, blessed by Hecate many, many years ago, and they are in grave danger, from what, says Chiron, we do not yet know. As the demigods later learn, the giants are amassing to attack with the power of Hyperion, Koios, and Krios behind them. The four demigods go to Hogwarts under the guise of foreign exchange students from Hecate's Academy of Magic. Their task is simple: protect the students, Harry Potter most of all, and prepare to take down their newest deadly enemies. Sure, they're on their own in a foreign country, but it's not the first time they've been outnumbered in unfamiliar territory. As the point of the battle draws closer, the rest of the seven will come to help, which helps to calm nerves among the demigods. The easiest part should be protecting the students and Harry. It is, but even with Annabeth's sister Hermione's help, getting the Chosen One and his best friend to trust the four demigods is easier said than done. A/N: This story will contain depictions of violence when the battle happens. It is rated mature for this reason. There is nothing else in here that qualifies as a mature rating, there is only some violence. Just an FYI for da readers. Oh, and the violence won't be that bad. It's just something you want to keep in mind. Also everything belongs to its rightful owner.