I really enjoyed this book. I picked it up for the Nidalese content, I don't know much about the region and wanted to fill in some blanks. It did not disappoint! I didn't expect, but thoroughly enjoyed, the way spellcasting was dealt with, especially Isiem's own spells. The author paid a lot of attention to the spell components, really brought home the RPG setting without ruining the immersion.
Decent story, there's a good mix of dungeoneering as well as political/military intrigue. I liked how magic was treated in the book, it's pretty widespread (at least in terms of potions etc), but that doesn't mean everyone has access to it. It was also nice to see more of the Nirmathas/Molthune tension too, that part was well done.
However, the chase and trap-finding scenes were too repetitive for my tastes, or not nearly spaced out enough.
Overall, great setting, and cool concept, but the delivery could have been better.