Based on a Frank Miller graphic novel that will be shot with the kind of stylized period green-screen action. Story of how Xerxes became this peculiar god-like entity. That mythology goes back to the death of his father, Darius, from injuries sustained at the Battle of Marathon in 490 B.C. Darius had told his son not to attack the Greeks because they can only be punished by a god, and so Xerxes tried to transform himself into a deity to gain revenge.