Set in ancient Greece during the sweeping conflict of the Peloponnesian War, this tale follows a Spartan mercenary, either Alexios or Kassandra, a grandchild of the legendary king Leonidas. As a child, the hero was cast off a mountain and exiled from Sparta, growing up far from home as a wandering sellsword on the island of Kephallonia. When a mysterious patron hires them for a fateful assassination, they are pulled into a web of intrigue that reveals a shadowy organization, the Cult of Kosmos, secretly manipulating the war and hunting their bloodline. Learning that their long-lost family may still be alive, the mercenary sets sail across a vast Aegean world of warring city-states, gods, and myth, seeking to reunite the scattered members of their family while dismantling the Cult piece by piece. Alongside loyal companions, they carve out a legend of their own among heroes and monsters alike.