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The Real Killer was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the Portable Animus HR-8.5.
In the wilderness, Kassandra came face to face following the fallout of Stentor's demise.
Dialogue
Kassandra found a couple of Spartans camping out in the wilderness, and approached them benignly.
Kassandra:Spying on those Athenians is no easy task, Spartan. Anything I can do to help?
Man:You, traitor! You deserved to be killed for killing our general, Stentor of Sparta.
Kassandra:I did kill Stentor. He left me no choice.
Man:I knew it was you! I'll do what the Spartan soldiers should have done at camp!
(fight ensues, quest fails.)
Kassandra:The man you speak of was my brother.
Man:Oh, I had no idea. My condolences, misthios. Maybe I confused you with someone else.
Kassandra:Maybe you did.
Kassandra:I don't know anyone named Stentor. You must be thinking of someone else.
Man:I thought I heard that the misthios that killed him had an eagle or something... Maybe I was wrong.
Kassandra:Maybe you were.
Man:Come to think of it... I did hear of another strange mercenary who arrived here recently. He must be the real traitor!
Kassandra:And you want me to kill this mercenary.
Man:His blood must be spilled.
(Accept - I'll kill the mercenary.)
Kassandra:I'll handle this.
Man:Good. Please be quick.
Kassandra:I'll come back when I'm done.
Kassandra left the soldier and hunted down the mercenary. Afterwards, she returned to the soldier.
Outcome
Kassandra defeated the mercenary.
Trivia
This memory seems to be triggered by the death of Stentor during The Conqueror. However, it may also be available even though Stentor is alive and well and aboard the Adrestia.