It was meant to be a final mission. At the behest of the shady antiquarian Randall Tillinghast, who makes them an offer they can't refuse, the investigators travel to the South Pacific and the vast, extraterrestrial city of R'lyeh. But the more they explore, the more horrors they uncover, and as the feeling of dread intensifies, the investigators - and all of Arkham - face a tremendous threat.

The time has come. Cthulhu has awakened, and Arkham will never be the same again.

In the campaign expansion Drowned City, one to four investigators explore the mysterious and deadly city of R'lyeh, which rises from the depths of the ocean. On their way to the tomb-like ruins, players climb the crumbling foundations of the city, scour the ocean floor for extraterrestrial artifacts, navigate through insane machines and shifting corridors, and uncover an ancient tale that has sunk along with the city itself. Along the way, they experience a unique story that changes depending on the chosen investigator and culminates in an ultimate battle against Cthulhu himself!

This expansion includes the entire Drowned City campaign. Players only need a copy of Arkham Horror: The Card Game Revised Core Set to dive into the story.