Observation: the temple is shaped like a beholder, with each of the 10 chambers off of the main cavern representing an eyestalk. Seems like each chamber may be thematically tied to the power of the stalk it represents.
The 2 slave pens could represent the charm monster and charm person stalks. The crypt = finger of death. The torture chamber = inflict wounds. The black orb could be disintegrate or flesh to stone. Some of the chambers don’t map cleanly. I feel like this is important, but I’m not sure why.
Do the locations of the “keyholes” on the vault door approximate the layout of the temple eyestalk chambers?
Wonder if we overlooked something in those rooms that we could use to open the door.