Sorweel is easily becoming one of my favorite characters. He just has so much room to grow. I love when Orinaral explains to him that if he isn't for the Consult, then Kellhus is his Saviour. Reading that, you could almost feel the conflict in his mind in heart. Following him into the Holy Deep has to be some of the best visuals I've ever had reading a book, Ishtinbererith and the horrors of it, just comes to life. In my mind, what Sorweel has learned through Orinaral and finally Orinaus is enough for him to shed Yatwer's hold on him. I think that now he knows who the true enemy is, Golgoterreth.
Serwa is a bad, bad woman. Her singing and that keeping the Torturer at bay and at odds with his self was brilliant. I don't agree that she was doing any mundane singing there at the end when Sorweel took out the gag. My reading is that she is sacrificing herself to the wishes of her father, "show them my dread portion" i.e. the MetaGnosis. I venture to say only Sorweel and Moe Jr. make it out. If she does, I have absolutely no idea how.
Moe Jr. has just been transformed into his true father. Physically and mentally. Probably won't be much that will compare to the horror inflicted on him in Ishtinbererith. And, if he wasn't nuts before, well, look out.
I agree with Som that we'll see the Tall and what others who realize their folly come to the aid of TGO, on the Fields Appaling. And, man what a scene that will be.