The Nightmares Underneath

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. This product includes both the first edition and the newly revised second edition.
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. Perhaps you might recover items of great magical power from the ruins of the Ancient World that will help you banish these nightmares. But can you trust these devices from the Age of Chaos?
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 (but not magic items), and there is a simple system of rolling under your attribute scores for saves and skill tests.
Some aspects of the game are less common:
Initiative is rolled again each round, but only by the players—monsters always use the same initiative scores.
There are 5 alignments, instead of the usual 3 or 9, and they affect the way a character interacts with magic and social institutions.
Instead of hit points, this game uses a Disposition score, which you roll for each day of adventuring. Once your character runs out of Disposition, instead of dying, successive damage reduces your attributes, and may cause you to be crippled, maimed, or knocked unconscious before being killed. The special attacks of monsters may also reduce your attribute scores instead of causing normal damage. Disposition does not increase with level, however. Only a good night's sleep and a hearty meal will give you a high score.