Later that same year, during the Battle of Hogwarts, it was used as an evacuation route to move the students away from the dangers that followed. Later, Harry realised that Rowena Ravenclaw's Diadem, one of Voldemort's Horcruxes, was hidden in the Room of Requirement, as he has seen it in his sixth year while hiding his Potions book and had even picked it up without realising what it was.[15]