In Immortals, each game is just another episode in the eternal cycle of war between the Light Realm and the Dark Realm in the World of Twilight. The armies defeated in one world are resurrected in the other world.
It is each player's aim to control and make efficient use of the different areas and their resources (inhabitants, gold, energy) in both realms. The player who most successfully implements their ambitions will be the winner of the game.