This book was SO freaking good. The magic system is well crafted, with both amazing possibilities but also significant constraints. This is a magic which can produce incredible changes in the world, disastrous backlash, and a serious drug. The real world fall out from such a magic is expertly woven into the story making a very fantastical story also powerfully believable. While showcasing this great magic in an epic adventure, this book never ceases to be equally about its characters' relationships to one another. Really awesome and thoughtful and riveting and touching, this is a book you don't want to miss.