The Nightmares Underneath is an old school role-playing game with a strong horror theme, set in a fantasy Middle East where dungeons are invading nightmares intent on the destruction of civilization. In the Kingdoms of Dreams, all is right with the world—except for one thing. Even though the Law has triumphed over the powers of Chaos, banishing idolatry and superstition in favour of science and reason, humanity is still threatened by a dangerous, otherworldly force. The Realm of Nightmares invades the physical world, sending incursions in the form of dungeons to undermine and destroy society.