Cog of Rot

A pungent stench fills this pentagonal room, the walls of which are covered with riveted sheets of iron. A wild garden full of sickly plants and rotting compost takes up most of the interior, and a narrow path hugs the walls between two exits. Jutting from the middle of the garden is a six-foot-tall rusty sprinkler. In the ceiling above the sprinkler, a ten-foot-wide shaft leads straight up.

Whenever this room is rotated by the controls in the Control Room (area 61), the sprinkler draws water from the underground lake (area 65) to spray the plants in the room. Magic keeps the plants alive despite the lack of sunlight.
If the cogs are turned so that one of the doorways lines up with the Gas Filled Room (area 63) to the north, gas from that area billows into the garden and transforms random piles of compost into three shambling mounds, which rise up and attack any other creatures in the room. After 1 hour, the shambling mounds revert to dead compost.
The shaft in the ceiling ascends 15 feet to the Gargoyle Guardians (area 45). To scale the smooth walls of the shaft, a character needs a climbing gear or magic.