A Harry Potter and The Lost Boys (1987) crossover
Disclaimer: I do not own Harry Potter or it's characters, nor the Lost Boys or it's characters.
Description:
Vampires have never been allowed to attend Hogwarts for reasons of safety. That was until wizards and witches all over Britain declared that they have the right to learn if they wanted to as long as they possessed the magic that most wizards and witches were born with. They helped vampires fight for this right as beings for a long time.
The Ministry has come to a decision to conduct an experiment that involved Hogwarts School of Witchcraft and Wizardry. They have requested for Dumbledore to take on this experiment head on to see if they can be reasoned with, trusted, or even tamed. Dumbledore knew that the Ministry would have other things in mind if they could "tame" vampires, but he agreed only because perhaps vampires can be trusted if he gave them a purpose before the Ministey could use them.
So he searched for the perfect guests. He decided it should be someone not of the wizarding world. He figured if they were muggles, they would find a lot to learn at Hogwarts to give this world a chance. But the only vampires he could find in the muggle world that had magic were all the way in California. In a town called Santa Carla, the Murder Capital of the World. . .
In the epic conclusion to the Devil's Deal series, Freya has one final chance to discover the full potential of her own power, and to use it to restore balance in the universe - once and for all. After the destruction caused by Roisin, Ferya and Torix come to terms with their losses and mistakes... And prepare for a final battle that will change everything.