From the back cover: "Ultimate Prestige Classes, Volume 1 is the first volume of the Ultimate series, compiling some of the best prestige classes available. Designed to be seamlessly slotted into any fantasy-based D20 games system, these sourcebooks offer the best of the best that have appeared in terms of rules and options for fantasy D20 games, as well as new material that can both be easily included into any campaign. Players and Game Masters will find a wealth of options to enrich their characters and antagonists."