Great concept, poor execution.
This is the second book of the series, which means I'll be more critical than the first.
Typos: While lessened vs. the first book, there were still plenty of them and right grammar usage. By itself, it wouldn't have been an issue but...
Characters: There's no consistent progression and interactions and events can sometimes look like they are just there to get the story from point A to point B.
Magic: A few people have said here that they love how well thought out the magic system is. I would disagree. Every "school" seems to have a ranged spell and a defense spell. (Fireball, firewall) (Ice shards, ice wall, frost). But you come to the death mages, they have stuff that makes sense like risen, and rot, but what about the coil? This can and should be better.
The positive is this, all of these things can be fixed/adjusted by having either a better editor and/or more pre-readers willing to give their honest and unbiased opinion.
I will pick up #3 when it comes out and see how things are.