(15) You enter a chamber which has three doors, two of which open to corridors leading to the southwest and southeast respectively. To the northwest there is a room (16, door open) lined on all four walls with floor-to-ceiling shelves, crammed with books, jars, and material for as well as spell components - from the looks of it. A total of 16 brass braziers, a pot of pitch, five intact and three broken turtle shells are placed all over the room, around and on a sturdy trestle table and two high stools.
The chamber (15) sports a couple of empty torch brackets, while a sigil in red mosaic tiles is inlaid in the centre of the pale grey floor. It is somewhat darkened and from the whole in the ceiling right above the sigil, you make out that there once was a trap spell placed on it. More interesting to the onlooker is the corpse of a human male hanging upside down from a heavy chain near to the door to the northwest (room 16). The fellow was badly humilated, his lower left arm is missing, as is his throat. A gaping whole is in the place were his stomach should be, on closer inspection one might see the spine in that bloody mess. From the tracks on the dusty floor you can easily determine that the guy was slaughtered in the room to the north, then dragged to this place and chained to the ceiling. If you look for it, you will find the missing parts of his body there.
The hallway to the southwest (18) is lined on both sides with about a dozen life-sized stone statues, which look very lifelike. They depict hooded humans (it seems, but one can hardly tell) clad in robes featuring various ornaments, symbols and the like. Two doors can be spotted in the darkness here, one leading to the northwest, the other at the end of the corridor. All is silent, but the hallway seems to have seen much traffic recently.
The second hallway, to the southeast, has three doors, one to the south, two to the north. It ends in what appears to be a natural cavern and you hear a faint rush of water from that direction too. Again, the dust on the floor has been disturbed quite often, not least in recent hours.