Imagine a race of lycanthropes so devious, so cunning, and so insidious that they conquer entire kingdoms without ever being seen. These are the wererats. Their secretive broods infiltrate key posts in the government, military, and guilds, ensuring political protection from their enemies. When fighting can't be avoided, the mystic Council of the Flesh unleashes its horrific cross-bred monsters, which never give a hint as to their wererat origins. When nothing else works, the hard-hearted Weavers spread filth and disease, eliminating entire cities with a single contaminated breath. Kingdoms fall, power changes hands, and the enemies of the wererats are exterminated, without a single outsider ever knowing how.

This book uses the 3.0 edition of the d20 rules set, and is fully compatible with the world's most popular role playing game.