Yarthe is an alternate Earth, where neither the history nor the geography precisely match our own. It draws on multiple periods of history, and multiple mythologies – both traditional and modern – for its structure and rules.

There is space for many campaigns and stories to run in this world, ranging from the steampunk technomancy of Europa to the wilderness adventures of the Pictish Halfling tribes of the Western Isles, from the secrets and intrigues of the Empire of the Sun to the high-tech corridors of the Imbrian colony on the moon. There are even rules to play dragons!