After Act 2

In this chapterAt the Battle of Amphipolis, the hero supports the Spartan general Brasidas against Kleon's Athenian army; both Brasidas and Kleon die in the battle.

At Pylos, Deimos defeats the hero and captures them. In Athens, the hero learns that Kleon, a Cultist, has taken advantage of Perikles' death to take control of the city. With the help of allies in Athens, the hero escapes and joins Brasidas at Amphipolis. The battle ends with the death of both Brasidas and Kleon, which brings the first phase of the war to an end.

The war is a constant background to the story. The hero's actions shift the balance of power in regions, but the major outcome is decided by the Cult. The war storyline is the political centre of the game. The hero can influence battles, but the war's long-term result is decided by the Cult, whose members sit on both sides.

Kleon's rise shows how the Cult uses democracy as a tool. Athens' leader is a Cultist who gains power through fear and popularity. Amphipolis is a bittersweet moment. The two commanders who both wanted a decisive victory die together, and the war continues without them. The conquest battles allow the player to decide which side to support, but the game's theme is that neither side is purely good.

Kleon's rise shows the Cult using democracy as a tool of power.

In this chapterThe hero returns to Mount Taygetos and confronts Deimos.

The hero returns to the place where it all began, Mount Taygetos, to face Deimos. The player decides whether to kill or redeem the sibling, and that decision affects the rest of the family's future.

With the Cult's remaining members eliminated, the hero reaches Delphi and meets Aspasia. She founded the Cult with ideals of peace through order and is disgusted by its corruption under Deimos. The hero touches the Cult's artifact, sees the future and destroys it, then decides Aspasia's fate. The last stage is about decisions: what to do with Deimos, with the Cult's remnants and with Aspasia.

Returning to Mount Taygetos closes the circle. The place that began the hero's exile is now where the family either reunites or breaks permanently. Aspasia's role is the game's most morally ambiguous. She believes in the Cult's original ideals, and the hero must choose whether that ideal deserves to survive.

The pyramid artifact connects the story to the larger Assassin's Creed mythology: the hero sees events that will happen thousands of years later. Aspasia was a real historical figure, Perikles' partner, and the game uses her as the Cult's original founder. The choice with Deimos is the moral test of the entire game. Killing or redeeming the sibling reflects how the player views the family.

In this chapterThe hero meets their biological father, Pythagoras, who is revealed to be a descendant of the Isu, like Myrrine and Leonidas.

The hero meets Pythagoras, who is their biological father and a descendant of the Isu. He gives them the Staff of Hermes Trismegistus, which grants immortality and the responsibility to protect Atlantis' secrets.

In the modern day, Layla Hassan recovers Leonidas' spear and uses the Animus to relive the memories of the hero. In Atlantis, the hero tells her that neither Assassins nor Templars should win completely, and gives her the Staff. The epilogue connects the Greek past to the present through the Staff. Pythagoras' revelation explains why the hero's family was targeted by prophecy: the bloodline carries Isu heritage.

Immortality makes the hero a figure outside of time. The Staff is a gift and a burden, and the expansions explore what it costs to live forever. Layla's presence moves the series past Desmond's story. The hero's advice about balance sets the philosophical direction of the modern-day storyline. The Staff turns the hero into a figure of legend, and the DLC explores what such a long life means.

Layla's presence is the franchise's link to the next stories, including Valhalla.

In this chapterIn Legacy of the First Blade, the Order of the Ancients, the precursor of the Templars, hunts the hero to eliminate their bloodline, which it considers too powerful.

In this expansion, the hero is hunted by the Order of the Ancients, who see their line as dangerous. Darius, who is persecuted in the same way, becomes an ally. The story is also about the hero's wish to have a normal life after years of war.

Legacy of the First Blade links Odyssey to the origins of the Assassins and Templars, showing the first conflicts that led to the Brotherhood. The hero's wish for a family is a human counterpart to the story's mythic scale.

In this chapterIn Atlantis the hero serves as Dikastes under Poseidon and discovers the Isu's crimes against humanity, including Project Olympos.

With Aletheia's help, the hero finds the symbols that open Atlantis. Along the way they visit mythic realms: Elysium, the Underworld and Atlantis itself. In Atlantis, the hero serves as a judge and finds the Isu's experiments, then decides the city must be destroyed. Atlantis is shown as a civilisation that created and used humans as tools. Project Olympos, a program of experiments, is the proof.

The expansion also gives the franchise its explanation for Greek myth: gods and monsters are Isu or Isu creations.