Uruk, Mesopotamia, the 217th year of the Eternal Reign
The discovery of necromancy has changed the great city beyond all recognition. Billboards pulsating with the glow of lesser souls light up the streets. Greater souls and demons are bound to clay tablets, acting as judges and administrators. Skeletal servants perform menial labour as the underclass starves. Society is breaking down, and charioteer gangs run rampant.
You are one such charioteer. In your youth, you pledged your soul to the locust demon in exchange for magical powers. Now, you are slowing down, and the demon demands ever more souls, lest he collect yours...
The current prototype just lets you ride around in your skeleton chariot a bit.