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The Cthulhu Companion is a collection of new Cthulhu mythos lore, scenarios, and rules additions to the game. From this volume the Investigators gain two new skills and a chance to encounter prehistoric monsters, find a missing uncle, stop cattle mutilations, and solve a kidnaping. The grim prisons of four continents plus new Cthulhu mythos deities, races, and monsters help the Keeper propel the Investigators to madness. Player-characters will reel from new phobias and insanity types.