A large room, perhaps two hundred hooves square, opened up before them, and it was a breathtaking sight. Bright light -- brighter than anything Honour had seen elsewhere in the Rookery -- shined out from another one of those iron-caged magical chandeliers, which dangled from four chains that splayed out into the ceiling. And it's that ceiling that really caught her eye -- literally, for she almost had to throw up a hoof to shield herself from its brilliance. A colossal dome arched over the great room, reflecting the light back down as only something made from a precious metal could. The whole thing was silver, and the metal had been worked and hammered into a dizzying pattern of repeating geometric shapes, all focused on a large central circle that has unmistakably been made to resemble the surface of the moon, as visible from Equestria.