Forbidden Knowledge was the second expansion of Legend of the Five Rings Card Collectible Game and displayed the full terror of the Twelve Black Scrolls, while the corrupted Elemental Masters weakened the barriers imprisoning the Dark God, Fu Leng, and unleashed powerful Elemental Terror spirits on the empire. This set also introduced Regions, cards that enhanced and individualized Provinces, and Ritual spells, in which several shugenja joined their efforts to cast stronger magical effects.