Vampires at Hogwarts (Vampire Diaries/Harry Potter)

Niklaus Mikaelson decided to visit London one day. He noticed people wearing robes and carrying sticks around. After being attacked by them, he decided to call in his brother to find out what they are. What will the Mikaelsons do? Will they discover the magical world? Will this be good or bad? What will happen when they learn of Voldemort? And Hogwarts?