''Assassin's Creed Odyssey'' Kassandra is the protagonist of ''Assassin's Creed Odyssey'', in which her life and exploits in
Classical Greece are explored by Layla Hassan, who uses her Animus device to relive Kassandra's genetic memories via a DNA sample recovered from the broken Spear of
Leonidas. Within series lore, Kassandra was born in
Sparta in 458 BC and was initially raised by her mother Myrrine and stepfather Nikolaos. When Kassandra is seven, her infant brother Alexios is sentenced to death in deference to an oracle's prophecy which said he could potentially doom Sparta. While trying stop a Spartan elder from dropping Alexios off
Mount Taygetos, Kassandra accidentally pushes the elder to his death and is branded a traitor by the Spartan leadership, who compel Nikolaos to cast her down as well. Surviving the fall, Kassandra escapes from Sparta and makes her way to the island of
Kephallonia, where she is taken in by a
con man named Markos. Under Markos' care, Kassandra would grow up to become a skilled mercenary, renowned as "the Eagle Bearer." In 431 BC, at the onset of the
Peloponnesian War, Kassandra uncovers the existence of a
secret society called the Cult of Kosmos when she is hired by one of its members to assassinate a Spartan general known as "The Wolf of Sparta." After befriending a
naval captain named Barnabas and assuming command of his ship, the
Adrestia, Kassandra travels to
Megaris to fulfill his contract, only to discover that "The Wolf" is Nikolaos and that the Cult is targeting her family. Upon infiltrating a Cult meeting in disguise, Kassandra learns that the Cult orchestrated the war to take control of Greece, and had kidnapped Alexios following his fall from Mount Taygetos, brainwashing him to serve their cause and be their champion known as "Deimos." Vowing revenge on the Cult for breaking her family apart, Kassandra embarks on an extensive journey throughout Greece to eliminate its members and reunite her family, during which she allies with various historical figures like
Herodotos,
Sokrates,
Brasidas, and
Aspasia. She is eventually able to find Myrrine, who became the oligarch of
the polis of Naxos after leaving Sparta, and reconcile with Nikolaos and his adoptive son Stentor. Myrrine then convinces her daughter to help reinstate their Spartan citizenship and ancestral estate, and encourages her to rescue Alexios from the Cult's influence. Afterwards, Kassandra returns with Myrinne to Mount Taygetos to confront Deimos. Depending on key decisions made by the player at predetermined points of the game's narrative, Kassandra either redeems or kills Deimos with the actions have a direct bearing on the fates of the extended family members and determines whether there will be a successful family reunion for the main plotline's epilogue. After successfully vanquishing the Cult, Kassandra heads to their meeting place under the
Temple of Delphi, where she destroys their pyramid-shaped artifact and is met by Aspasia, who reveals herself to be the Cult's original leader and that she secretly helped Kassandra dismantle it after it had become corrupt under Deimos' influence. During her journey, Kassandra also collects various Isu artifacts at the request of her biological father
Pythagoras, the assigned Keeper of the Staff of
Hermes Trismegistus and guardian of the secrets of
Atlantis. After using the collected artifacts to seal Atlantis, Pythagoras relinquishes the Staff to Kassandra, who becomes its new Keeper and is granted biological immortality. In 2018, Kassandra, kept alive by the Staff of Hermes for thousands of years, meets Layla in Atlantis after the latter discovered its location from Kassandra's memories. After warning Layla about the dangers of Isu technology, Kassandra bestows the Staff to her, as she was instructed to do by the Isu Aletheia—whose consciousness is stored inside the Staff—and passes away.
Legacy of the First Blade The first story expansion for the game,
Legacy of the First Blade, set during the events of the main narrative campaign, follows Kassandra as she joins forces with
Darius, a Persian renegade and freedom fighter, to fight the growing influence of the Order of the Ancients, the precursors to the Templar Order, who are the series' perennial antagonists. The Order is committing atrocities throughout Greece to draw out Darius and the "Tainted Ones", people descended from the Isu, such as Kassandra and her family, which the Order seeks to eliminate, believing they have the potential to doom humanity. Over the course of the expansion, Kassandra starts a family with Natakas, Darius' son, giving birth to a boy they name Elpidios, who is later taken by the Order after they murder Natakas. Kassandra and Darius exact revenge on the Order and kill its leader, Darius' former friend Amorges, who gives them Elpidios' whereabouts but warns them that the Order can not be vanquished and that Elpidios will never be safe as long as he is with Kassandra. After finding Elpidios, Kassandra, concerned for his safety, decides to leave him with Darius, trusting him to look after his grandson. Darius takes Elpidios to
Egypt, when it is revealed that he would become an ancestor to Aya, a major character from ''
Assassin's Creed Origins'' and one of the co-founders of the Hidden Ones, a precursor organization to the Assassin Brotherhood.
The Fate of Atlantis The second story expansion,
The Fate of Atlantis, is set after the events of the base game and follows Kassandra's quest to learn how to unlock the full power of the Staff of Hermes after it was passed down to her. As part of her training under Aletheia, Kassandra is transported to a simulation based on the Isu realm of
Elysium, where she becomes involved with
Adonis' human rebellion against
Persephone's rule. Once Persephone is defeated, she banishes Kassandra to the
Underworld along with her dog Ros, who is transformed into
Cerberos. Kassandra slays Cerberos, but this opens numerous rifts between
Tartaros and the Underworld, releasing souls confined to Tartaros back into the Underworld. To contain the chaos,
Hades tasks Kassandra with finding new guardians for each of the gateways to the Underworld, only to betray her afterwards. Kassandra defeats Hades before
Poseidon appears and escorts her to Atlantis, where he appoints her as
Dikastes, his second-in-command, who is responsible with enforcing Poseidon's laws and maintaining order, as well passing judgment on Atlantis. While exploring Atlantis, Kassandra discovers that the Isu regularly disobey Poseidon's laws and commit crimes against humanity; the most egregious of which is "Project Olympos," a genetic engineering program led by
Juno and her husband
Aita, which combines abducted human subjects with Isu artifacts to create hybrid beasts. Deeming Atlantis beyond saving, Kassandra and Poseidon sink the city using the fully activated Staff of Hermes, causing the former to awaken back in the mortal world. There, she is informed by Aletheia that all the events she experienced were Aletheia's memories during her time as
Dikastes, and that she has proven herself to be worthy of wielding the Staff.
Those Who Are Treasured Those Who Are Treasured is a free story expansion that serves as an epilogue to the main narrative of
Odyssey, depicting Kassandra's final adventure in Greece. After taking a six month vacation on the island of
Korfu, a reluctant Kassandra is recruited by Barnabas and Herodotos for a treasure hunt they organised, which turns into a hunt for an Isu artifact—an
Apple of Eden—after Kassandra accidentally stumbles upon a group of pirates who are also looking for the relic. Kassandra is eventually able to recover the Apple, but it depowers the Spear of Leonidas and corrupts Barnabas, forcing Kassandra to fight her friend over the artifact. After saving Barnabas and destroying the Apple, Kassandra is informed by Aletheia that part of her duty as Keeper of the Staff of Hermes is to find and destroy similarly dangerous Isu artifacts around the world. Kassandra bids farewell to Herodotos, to whom she gifts her depowered spear as a memento, and departs Greece with Barnabas to begin her new journey.
''Assassin's Creed Valhalla'' Kassandra returns in ''
Assassin's Creed Valhalla as part of the free Assassin's Creed Crossover Stories'' DLC expansion. Kassandra's default outfit from
Odyssey (referred to in-game as Alexios' outfit) is an unlockable cosmetic option in the remastered version of ''
Assassin's Creed III, released in 2019. Kassandra is also featured as one of the three playable characters of the 2023 virtual reality game, Assassin's Creed Nexus VR. Her story arc is set in 404 BC, nearly two decades after the conclusion of Odyssey'', and follows Kassandra as she returns to Greece to deal with the Spartan oligarchy installed in Athens known as the
Thirty Tyrants As part of
Reverse: 1999 collab event with ''Asasssin's Creed: Odyssey'', both Alexios and Kassandra appear as playable characters. ==Promotion and merchandise==