Functioning as a storage area for most non-perishable class materials of all disciplines, the Storeroom is a treasure trove for both the curious and mischievous alike. Everything from defunct astronomy equipment to mildly cursed practice dummies can be found here. A truly gargantuan space, it's clear that someone put an extending charm or two on the room, once upon a time. This is also where the school's cleaning supplies are stored, so detention's most frequent flyers may be especially familiar with the space.