In the grand scheme of things, my predictions:
The Ordeal is a distraction, they never breach the Ark.
Kellhus ventures into Golgotterath itself, stumbles across some atrocities along his way to the Golden Room.
He is met by some combination of Aurax, Aurang, Shae et. al.
They show him the Inverse Fire and he either fakes it being fakes it being effective on him or just shocks them by being unmoved.
He kills them all, or consigns them to some similar fate.
Not sure where the No-God comes in, unless, perhaps, afterward Kellhus cavorts the process and so resurrects the No-God or something like that. Then, of course, Mimara will gaze on Kellhus and/or the No-God and answer it's question. "What do you see?" perhaps, "The End."