C. Circular hall

(Read The forgotten gelatinous cube above first.) Austere, high-ceilinged room with black walls covered with even blacker demonic runes. A baleful eye is painted on the ceiling, following the characters' every move. Not the slightest trace of dust on the ground or walls, all that can glitter glitters. Double iron door to the north. The door to the east was dissolved – only the part above six feet remains.