I stumbled on to this series by chance. As a reader of complex sci/fi and fantasy, I enjoy deliving deep into a story, getting to know the characters, understanding their world, etc. The Prince of Nothing series offers that in spades.
The premise of a frictional world where varying types of magic are contained in insular 'schools' and not shared with other schools is interesting. Add to that the adaptation of a more recent religious fervor that condems magic as blasphemy, and you get a great frictional universe to run a story in. Set against a backdrop of a forgotten war from thousands of years ago against evil so black it can read like a horror story, you can feel the frustration of the single school that remembers the war (through nightly dreams in which the relive part of it) and tries to not only watch for the signs it will occur again, but tries to warn everyone of the potential. The characters are well developed and have all the strengths and weaknesses of real people. There is no clear cut 'good'. Instead the frailities and weaknesses of the characters involved help drive the book in ways you do not always expect. Warrior Prophet is the second book in the series. You should start with the first, as it will help you truly understand the individuals involved in the outstanding fantasy series.