The Marked Warrior video is an unlockable video featured in Ghost of Sparta.
Unlocked through purchase from the Temple of Zeus, it tells a tale of two young Spartan children, Kratos and Deimos, trained to fulfill a shared dream: to join the ranks of the Spartan army. On an ill-fated day, Deimos was taken by the God of War, Ares, after being suspected of being the Marked Warrior. Kratos, who failed to save Deimos, then vowed never to falter again, adorning a red tattoo in honor of Deimos. It would later prove a somber reminder to Kratos, the man who would become a God.