The King in Yellow awaits... The disturbances caused by the upcoming Great Ritual have begun to tear at the fabric of reality, and well-known places have already been replaced by a distorted version of them from other dimensions. Meanwhile, the King in Yellow and his agent, the Pallid Mask, manipulate events from behind the scenes and poison the thoughts of unsuspecting people. And who is the mysterious plump man who seems to be following the party? Carcosa Rising is an expansion for Four Against the Great Old Ones based on the Mythos-related creations of Robert W. Chambers and Ambrose Bierce. Carcosa Rising includes two new classes (the Cool Doctor and the Dreamer), three alternate versions of Locations from the core book, an entire new setting (Carcosa), three event tables for movement, possible attacks of the Pallid Mask, and the final encounter with the King in Yellow. Finally, a generator of Underground Temples, allowing you to play in Lovecraftian-themed mini-dungeons, plus a poetic and creative manifestation of Echoes from Yuggoth. You can add any combination of elements taken from Carcosa Rising to the core game, to ensure no two games are the same! All you need to play is the core rulebook of Four Against the Great Old Ones.