There are things in the dark places of the world that are best left unseen by the prying eyes of man. Some horrors that cannot be fathomed. These are the nightmares from beyond, that haunt the deepest shadows, and feed on the fragile minds of those foolish enough to seek them out.
This 15 card Challenge Supplement adds an all new deck of Ruinous Nightmares to Shadows of Brimstone, allowing players to increase the difficulty of the Adventures. Choose from Nightmare Level 1, 2, or 3 to give your Heroes a serious run for their money. There are some extra rewards for exploring the more dangerous parts of this world though, and Heroes may find that if they can overcome the challenge, glory and riches await. But be warned, Ruinous Nightmares are not for the faint of heart. You have been warned.
-description from publisher's website