Odyssey's story begins in 480 BC, where King Leonidas leads the Spartan army against a Persian charge during the Battle of Thermopylae. The skirmish is won, but Leonidas is informed by a captured enemy that the Persian army has learned of the mountain path and will surround the Spartans by morning. Nevertheless, Leonidas resolves to hold off the Persian advance. In 2018, Layla Hassan recovers Leonidas' spear and extracts from it the DNA of his grandchildren, Alexios and Kassandra, to be used for her Animus to find the location of the Staff of Hermes Trismegistus. Whichever sibling is selected by the player (and therefore, by Layla) is designated as the Eagle Bearer.
Assassin's Creed Odyssey is an action role-playing video game played from a third-person perspective. At the beginning of the game, the player can select to play as either Alexios or Kassandra, Greek mercenaries and descendants of the Spartan king Leonidas I. In addition to completing the story campaign, players can freely explore a large open world set in Greece on foot or on horseback. As the player explores the world, they will encounter various non-playable characters (NPCs) who give players side missions to complete.
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