This is the old Christian chapel serving the upper level of Aeternis. It's an old, romanesque church area, that once served as the nexus of much of Aeternis. Although most of the temple is cut off, there are many exits from here to the rest of Aeternis.
The area is straightforward. The main nave leads deeper into Aeternis and requires installing the pianola roll in the pianola, as well as the second shield in the orrery. The hole that opens in the altar is a one-way drop to the arterial drain.
- Note from Cobweb: Found on the pianola's keys.