All ceilings are 10 feet high. The rooms and corridors have been carved out of—or in some cases, seemingly melted through—solid rock. Murky, standing water covered with floating patches of algae fills several chambers to a depth of at least 1 foot. (difficult terrain) Each door inside the mountain is 8 feet square and made of ironbound oak. Swollen from the general dampness, all the doors are somewhat difficult to open.