Fates Collide(A PJO/HP Crossover)

Eight demigods(+Calypso and Grover)go undercover to Hogwarts as students, where Harry Potter and his friends are retaking their seventh year. A new evil is rising, and the worlds must work together to stop it. But before that, the demigods must endure life at Hogwarts, where they(try to)learn magic, all the while(also...