This book presents rules, background ideas, and options for introducing lycanthropes as player characters into your campaign. Even if you would rather not have shapechanger PCs, you can use the rules and information in this book to add depth and detail to the lycanthrope friends and enemies the party meets. Tossing an unexpected element into a roleplaying game is one of the best ways to inject excitement and uncertainty into your game. With the prestige classes, new rules, and magic items found in this book, you can ensure that no two werecreatures are ever alike.