|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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This lower section of Hogwarts Castle was often flooded with purple and red rugs, it was connected to the Front Hall. Due to the fact that this section had many staircases until it reached the ground floor, its name suggests it may be underground the castle, plus it also has a direct door to the Dungeons.