Of Man-Beasts and Those That Eat Human Flesh
From Wulfgard Wiki
Of Man-Beasts and Those That Eat Human Flesh is a work by an unknown author. It is frequently used as one of the few books that claims to have any knowledge regarding certain of the most terrifying monsters in all of Midgard, namely werewolves. As so little is known about these monsters, the Venatori often cite this book - at least, those among their order who can read.