In One Word? Chaos Complete and Utter Chaos

What happens when a witch nearly as infamous as the Marauders themselves (and told as much by two of the remaining members) teams up with the Trickster god, Loki? Well, the Winchesters aren't happy. Neither are the demons. Or the angels. Will Voldemort even have a chance against Hogwarts at this rate? Or will it have already fallen to a witch nearly 70 years younger than him?