The Room of Requirement is a hidden room in Hogwarts castle on the seventh floor. In the Order of the Phoenix, The D.A(Dumbledore's Army) uses this room to practice the extra Defense Against the Dark Arts classes that are provided by Harry and they don't want the temporary headmistress/Dark Arts teacher named Dolores Umbridge to find out about it. In the Deathly Hallows, some of the D.A members use the Room Of Requirement as a hiding spot before going around the castle.

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