Missing Guildmate
You rush through the door, as a sudden tremor causes stones to fall from the ceiling, blocking the passage behind you. You only pause long enough for Charlotte to confirm she's alright, although stuck outside.
Running down a small corridor, you finally see the Oculory. It's a massive brass sphere, taking most of the room, with a stair case circling part of it to reach an upper balcony. Steam pipes connected at the base seem to change color from the heat, as a few jets of over-heated fluids whistles in place. Above you, you can see a delicate spider-like apparatus rotating, catching beams of lights from crystals in the walls, and trying to focus it on the sphere. But as you watch, it's clear they're not succeeding. The beam seems to bounce off the sphere at weird angles, causing rainbow spots to light the walls.
On the upper balcony, you can see Tiariai, working some form of old controls. When his two assistants point out your presence, he looks down, only to scowl as he realizes Charlotte isn't with you. "Keep them busy, I need to deal with this..." he says, continuing his attempt at adjusting the apparatus.
You're not sure how this things can be shut down, but it looks like the longer the light remains unfocused, the more the sphere heats up, and the more things shake and leak...