Arnhack

A Game of Madness and Mayhem

From the introduction:

The default assumption when playing Arnhack is that the characters are in a world called Arn. You can use other settings with this game, but some changes may need to be made to support a different world.
...
Arnhack is a game of horror and violence. It is designed to take place in a world that used to be a land of myth and legend, of great heroes and world threatening evil. But no longer is Arn a place of daring adventure. It is a world of stagnance and decay where peasants cling to stories of old to distract them from the mundane drudgery of serfdom.