Wow. That's all I can say about this book. I've had my issues with the previous entries, while they were good, something was always holding it back. This one didn't. This was an absolutely perfect ending to the series. My only, and I do mean only, complaint of the book, is the holding back of killing more of the characters. With how the series built up, and how impossible the stakes were, it seemed like the author let certain characters live because he didn't want to kill them off and upset readers. I understand, but there is really not much of a reason on why some of them survived. They just did.
Besides that, I loved everything about it. The majority of the book is the final battle/war. And it was so cool bouncing between all the different angles and seeing what was happening where. And also, all the hints and "visions" throughout the series being realized in a way I didn't expect until the end was a nice touch. I'm incredibly glad I gave this series a chance, and kept going after I wasn't fully convinced after the first couple books.
After the ending, and the "Afterwords" at the end, I'm excited to see what comes next, and hope something actually does come next. It sounds like that's the plan, and I'd love to keep exploring this world.