It's not possible to say much about this book without spoilers, but suffice it to say that this is, aside from the standards (LOTR, Narnia), this is the only saga series I have ever read from first book to last book. Since this is basically the first and only (so far) that's kept me entertained and intrigued enough for me to complete, i don't have much by way of comparison, but as finales go, this was amazing. It was the very definition of a page-turner.
I have to admit, I wasn't super eager, going in. I had enjoyed the previous book a lot and really didn't relish the idea of going back to Aydrian's storyline. But Aydrian has developed since last we knew him, and that makes it more interesting, but the continuing development of several other major characters makes the story what it is.
It was also unexpectedly emotional, for me, to return to some of the settings from the first trilogy. I didn't realise how familiar I'd become with the world of Corona, but revisiting old sites and characters I'd mostly forgotten about was actually nostalgic (and it hasn't been *that* long since I read the first books). Maybe this is the pleasure of a saga series that I miss out on by dropping series of books after the first two or three, or maybe it's actually done really well here.
Finally, I couldn't help but compare this story to Star Wars - probably because I know that Salvatore has written several Star Wars books, and because Star Wars is finally getting wrapped up now. There are really obvious comparisons to make between Aydrian and Anikin (significant parentage, serious fall from grace, whiny youth, tyrannical adulthood), but I think this book shows just how good the prequels and sequels *could have been*. It is possible to tell this story well. Where Star Wars has failed me, Salvatore has succeeded. And he has succeeded in a big way; he introduced a universe I didn't know or care about in The Demon Awakens and turned me into a diehard fan of the Corona universe.
And if you're an RPG gamer, this series is a great journey into a parallel realm. The first three books were excellent examinations of what it means to be a Ranger class. The series does a great job at exploring the psyche of the fae. And the final three books explore Bards, various curses, and a few spells. The soul stones are nicely developed in this book, too; they're sort of the pocket editions of the Player's Handbook, with all kinds of cool spells we'd not seen in previous books.
All in all, an amazing series. Highly highly recommended.