My party is about to encounter Nhur Athemon; they're excited for what they believe to be the "main boss" fight of the Spire. I've been telegraphing his presence a lot with Crowned Skull encounters, including an assault on the PC's home in Fort Inevitable. As I expect the PCs to survive, I've begun prepping Level 15.
Two questions come: 1) Has anyone dealt with the revelation that Nhur Athemon was in fact not the true master of the Spire? Any tips for the same?
2) How would you present the Inevitable rescued from Level 10 on Level 15? The book indicates he is in the first room the PCs enter. Since they have a tentative alliance with the Inevitable, it seems likely that this would push them into the full alliance for the level. But I'm not sure how to present such a creature's notion of "Gratitude."
Any help or suggestions would be appreciated.