Assassin's Creed Odyssey is a 2018 action role-playing video game developed by Ubisoft Quebec and published by Ubisoft. It is the eleventh major installment in the Assassin's Creed series and the successor to 2017's Assassin's Creed Origins. Like its predecessor Assassin's Creed Origins, the game features a large open world and adopts many elements from the role-playing genre, putting more emphasis on combat and exploration than stealth. Naval combat from previous titles in the series also plays a prominent role in Odyssey. The game's setting, while fictional, is based on real-world events. It tells a mythological history of the Peloponnesian War between Athens and Sparta from 431 to 422 BC. Players control a Spartan mercenary, who fights on both sides of the conflict, as they attempt to find their family and eliminate the mysterious Cult of Kosmos. Odyssey also continues the story arc of Layla Hassan, a major character introduced in Origins, who relives the mercenary's memories through the Animus device as part of her efforts to locate a powerful artifact on behalf of the Assassin Brotherhood.