Hogwarts occurring is a passage to the Hog's Head bar that formed before the Battle of Hogwarts. Due to the nature of the Room of Requirement, it is possible that several passages to different locations could be accessed from the Room. The three passages out of Hogwarts that Filch does "not" know about are: A further link between two vanishing cabinets, one in the school and the other in Borgin and Burkes in Knockturn Alley presumably worked until "Chamber of Secrets" when Peeves (persuaded by Nearly Headless Nick) smashed the Hogwarts cabinet. The passage was reopened in "Half-Blood Prince" when Draco
Hogwarts staff However, in the American edition of "Half-Blood Prince", it is re-spelled as "Sybill", matching the UK edition. Professor Trelawney is portrayed by Emma Thompson in the "Prisoner of Azkaban", "Order of the Phoenix", and "Deathly Hallows Part 2". Hogwarts houses at least twenty ghosts, but when people in the novels speak of the ghosts at Hogwarts they usually refer to one of the four resident ghosts of the Hogwarts houses: Sir Nicholas de Mimsy-Porpington (or, as the students refer to him, Nearly Headless Nick), the almost beheaded ghost of Gryffindor house; the Bloody Baron, who is the ghost of Slytherin