Swords of Cthulhu

From publisher blurb: New options to expand your old-school roleplaying game! Plumb the rich depths of Lovecraftian horror with new races like Deep One hybrids and Degenerates, new classes like the cultist and the scholar, new skills, complete insanity rules, the Dreamlands, the Old Ones and Outer Gods, and much more. For both players and game masters.