Neville drew his wand and traced out the special access rune to open the door, a secret that only he and Harry knew about. Harry made a mental note to show Hermione what it was later, before following Neville inside. The room was gloomy, curved in shape, with only one piece of furniture inside ... a table shaped a little bit like a boomerang. Twelve milky orbs, about the size of footballs and glowing with their own subtle light, lined the table. They emitted a barely-audible hum, that infused the room with a weird, sonic-like charge.