Set in ancient Greece during the Peloponnesian War, the player takes the role of either Alexios or Kassandra, a Spartan mercenary cast out from their homeland. On a journey that spans the Greek world, they must uncover the truth about their fractured family while navigating the conflict between Athens and Sparta. Along the way, the protagonist becomes entangled with a mysterious cult operating in the shadows and discovers a connection to a civilization far older than their own. Their choices shape alliances, determine the fates of those around them, and influence how history unfolds across the Greek world.