Cronan the Librarian (Black Dragon Trilogy)

"In a world dominated by the Blackabbots and their evil black dragons, the Ogmus have been driven underground into the mountain refuge of Hope. The Book of Prophesies, written by the drug-crazed prophet Nostra, tells of the return of the good dragons, led by the great magician Snorkel, and the liberation of the Ogmus. Unfortunately Nostra's writings are rather cryptic, and almost impossible to understand for anyone who isn't high on poppy juice. Cronan, the Ogmus librarian, has devoted his life to deciphering the book, but hasn't quite finished when it is stolen. As a reward, he and his assistant Tobias are sent into the outside world to try to find Snorkel and bring the good dragons home."