The artifact was a part of the Olympos Project and was capable of transmutating its host. The Isu Persephone used this artifact to transform the dog Ros into Cerberos until it was seized by the Spartan misthios Kassandra after she defeated the beast in combat. When Kassandra used it in conjunction with the Staff of Hermes Trismegistus and the artifact used to create the Hekatonchires, it activated a mechanism that initiated the destruction of Atlantis.
Behind the scenes
Due to Cerberos' nature as a simulation, it is unknown whether it or a similar creature was ever a part of the Olympos Project proper and if the Prize of Cerberos was an actual Atlantis artifact outside the simulations.
- Assassin's Creed: Odyssey – The Fate of Atlantis