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 dungeon to undermine and destroy society.
The Nightmares Underneath conforms to the following common assumptions of other old school games: six attributes, 3d6 in order, class and level, xp for treasure, spells are memorized, and there is a simple system of rolling under your attribute scores for saves and skill tests.