I really like the Deryni series and I wanted to like this book. Too bad I just couldn't. When the author refers to quotes from her own books as "(a character) entering something into the canon," you know something's not right. Though the book is helpful in compiling most of the instances of magic in the books so far, the overuse of quotes and the dull writing make this a chore to work through. Magic is classified into uses which serve as chapter headings and then doesn't keep to the subject. Not much is "revealed" either, or even clarified. I learned more just re-reading the original books. A definite miss.