A low, steady humming rapidly intensifies as the party approaches the center of the Observatory. It is accompanied by slight din of commotion - the sort that is common when there are many people together in the same room.
Again, the doors to this room have been removed, in favor of open archways; Zerome and Archibald do not appear to have much use for such barriers, here in their repurposed floating fortress.
On the far end of the room from where the party approaches, there is an enormous computer; this is the source of the humming. It has no discernible user interface, and appears designed solely to maximize processing power. It takes up the entire wall, which stretches nearly fifty feet high.
A line of people is shackled to the right wall, including a tree whose trunk and branches are fastened to the wall with metal bands. Its roots are connected to some kind of machine, which seems to be keeping it alive.
The others shackled to the wall include Fe, Cu, Arlen Firebeard, Hugh, Pepa the Kobold, and the villagers from Mako's home town who had made residence in her so-far-unseen domain.
On the left wall, the Raven Queen is shackled in a similar manner. Her expression is angry and defiant, but she is trapped all the same.
In the center of the room, between the party and the giant computer, are five people: a line of three, and behind them, a line of two.
On the left in the front row is Brick - the large man who Fleshbane might recognize from Ciel's quarters. He is sporting some machine-like equipment, but is still mostly human.
Next to him, in the center, is the reanimated, mostly-machine demon that the party previously vanquished outside of the Observatory. It appears to be in fine health, though its stature is obviously diminished when compared to before.
On the right in the front row is Ozzan'gac - a giant head made of water, except now the water that comprises him is neither clear nor blue, but instead a murky shade of gray.
Behind them, on the left is Zelio. His body has been modified extensively by machinery; his face is untouched, but even the crown of his head has something on top of it.
On the right is an unfamiliar man, wearing a body-tight suit of ballistic armor and a red cape. His hair is short, black, and slightly spiky; he looks young.
"Welcome home," the demon says, in the same monotone drone of Zerome.
((Time for reaction scenes + initiative rolls. I will be controlling Au for this battle. I have not had a chance to put together a map yet; sorry about that))