spoilers!!!!!!!!!!!!!!!!!!!!!!
I teared up badly when Jeffey reverted back to his autistic state after touching the hilt of the sword.
I think the biggest complaint I had with Nightworld was Jack's goof ball behavior when confronting the newly transformed Rasalom in the cavern, with Glaeken.
He said something like, "Let me take a few swings at him." when they were still in such an uncertain state, with the world (including Gia and Vicky) in the balance. It just seemed more like a kid wanting to take a few swings in a ball game.
It would have worked better, for me, had Glaeken gotten so exhausted attacking the pillars that he collapsed, or dropped the sword, and Jack picked it up saying, "I'll take it from here, my friend.". Instead he jumped in like, "let me play". It really took the steam out of what was happening.
That said, The Tomb, in it's original form, still stands as my favorite book of all time. I've read a bunch of books since then, but no character, or story, has resonated more with me.