The most influential event in Atheus is the Year of the Exile. It set up the division of the world into east and west, the human's side and the barbarian's side, respectively. But how did it actually happen? How did one race manage the incredible feat of the exile of four other races?
A basic history of the continent of Atheus.
"So's ya want ta know about the maze and the labyrinth? There's a difference, ya know. The maze is more like a, a, puzzle, a puzzle where ya wander and gets lost. An' a labyrinth is more... straight, ai guess, straight with curves, if'n ya gets what I'm sayin'."
-Old Gerald, man in the pub.
The great Wall Mounts have been scaled, or your ship's technology has reached a level in which it is possible to cross the oceans. And when the PCs or NPCs find other people, unknown people, what happens? Carnage.
"Your wall is impenetrable, eh? Its so thick it can withstand 100s of direct hits from any siege engine? I have but one word for you: magic."
A town has a festival every year in the dead of winter. The festival of birds. The towns folk dress in feathery robes and beaked masks and dance and frolic in the belief that the changes of the seasons are controlled by the presence of birds. According to tradition, the festival tricks Spring into coming early because the birds have returned.