 The futuristic Earth is a strictly caste-based society, the reason of which is explained in "Blade of Tyshalle".After the discovery of Overworld, Actors are sent there to entertain Earth's population, by "putting their lives in danger in interesting ways".Overworld is a fantasy world, featuring an array of Tolkien-inspired races, such as primals/feys (elves), stonebenders (dwarves), ogrilloi (orcs), ogres, and trolls.