The Room of Requirement is a room within Hogwarts that only appears where a person needs it. The room then transforms itself into whatever is needed of it. The room is located on the seventh floor of Hogwarts, once accessed the room is furnished for the seekers needs. Harry Potter used the room during his fifth year to teach defence against the dark arts to a group of students known as Dumbledore’s army, the room providing them with everything they needed to train. In his sixth year Harry used it again to hide the Half Blood Prince’s potions book, this time the room was crammed full of items that other students across the years had hidden. On one occasion we are told that Dumbledore himself had found a room “full of chamber pots” when he needed to use the toilet, proof once more of the rooms powers.