One shapechanger stands above them all as the ultimate source of fear and cunning. For centuries, werewolves have been staples of folklore worldwide, spreading terror in the night while hiding amongst mankind in the day. Now the Complete Guide to Werewolves brings this historical monster into your d20 game. Grounded in folklore from multiple cultures, this thorough and imaginative sourcebook gives you everything you need to engage the world's most dangerous shapeshifter. The Complete Guide to Werewolves takes a comprehensive view of its legendary subject. With material based on mythology, it offers new options for werewolf characters, including not just the usual assortment of feats and prestige classes, but also rules for breeds, lunar influence, and weaknesses or "thorns." Every aspect of the lycanthropic process is examined, from life stages to mindset to new lyncathropic diseases, and the book includes a selection of powerful NPCs and new monsters ready to be inserted into any campaign. This book uses the 3.5 edition of the d20 rules set, and is fully compatible with the world’s most popular role playing game.