If one were to remove the bar from the southern door of Room 1 and then hack down the swollen planks from their framing stone, they would find a room approximately thirty feet square, with a protrusion to the south 20 feet wide and 10 feet deep. To the left and right (east and west), five foot wide corridors proceed into gloom.
The central 20 feet of the room is a vast, circular hole with a narrow stone lip. Ascending out of the darkness are numerous white, chalky vines, here and there marred by blood-red leaves. A few lurid yellow blossoms, reminiscent of tansies, also grow from these vines, which reach all the way out of the great pit, creeping along floors, walls, and even ceiling to arch back upon themselves at the southern end of the room. The whole of the "plant" glows dully with a faint white lumiscence. The frame of a double door is barely visible behind a clot of white vegetation in the southern wall.
A lit torch thrown into the depths of the vegetation (or some other light source) reveals a similar landing, 15 feet below this floor, and even a second, 15 feet below that. Beneath that, though, is a vast white tuber, apparently the source of the profusion of vines. It appears to have grown or been forced from yet a third landing, 45 feet below the level currently stood on. The tuber is irregularly shaped, and seems to have a root structure which descends still further into the shaft.
The vines are edible- though wholly foul-tasting- and the blood-red leaves can be boiled down into a concoction that will, if ingested, provide a +1 bonus to saving throws versus poison for 24 hours. Partaking of any part of the flowers, however, will cause the eater to have vivid, bizarre dreams when next they sleep- dreams of strange, red towers looming from dunes of black ash, while a pale white sun hangs low in the sky. The dream ends as shadowy figures lurch toward the dreamer, changing and growing more like the dreamer in form and face as they approach.
The vines are also more than strong enough for an armored man to ascend or descend to the landings below...