Call of Cthulhu offers the entire Earth as a setting in a variety of different time periods. The American Old West is covered in Down Darker Trails from Chaosium, which presents not only a rich historical setting but also a supernatural one.
Mythos World: Rules, Adventures, and Setting
Call of Cthulhu offers the entire Earth as a setting in a variety of different time periods. I am slowly building my own Mythos world and revealing the secret history and details of a world haunted by monsters and the Mythos to the PCs. I am working on creating a long term campaign.
Mythos World: Rules, Adventures, and Setting
In 1925 your expert detectives work to keep a post-war and divisive world from falling apart.