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There Can Be Only One was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the Portable Animus HR-8.5 and a memory of Layla herself.
Armed with a viable clue given to her by Megakles, Kassandra set out to find the impostor pretending to be her.
Dialogue
"Eagle Bearer":The actual Eagle Bearer. That explains why the invasion failed.
Kassandra:Despite everything you tried to do, Alponos is safe, and I cleaned up the mess you made.
Kassandra:I've been stuck cleaning up your mess since I got here.
"Eagle Bearer":What a glorious mess it was. When the pirates paid me to soften the town's defenses, I didn't think it would be so easy.
Kassandra:People are dead because of you.
"Eagle Bearer":I didn't kill anyone. But you did. We make a great team that way. I steal some tools or blow up an old man's forge. Send some young idiot into bandit-infested mountains. "Lose" a general's steed. Then watch you turn it into pure chaos.
Kassandra:The fact that Megakles and the pirates both paid you is just a bonus.
"Eagle Bearer":Everyone pays to hear lies they want to believe.
Kassandra:I'm impressed. Even I don't play both sides like that.
"Eagle Bearer":I can be even more impressive. You've never thought about it? What it would be like to be with the Eagle Bearer? You're not even a little curious?
Kassandra:Now's my chance.
"Eagle Bearer":Eagle Bearer, I...
Kassandra:Shut up.
Kassandra:So, that's what it's like to be with the Eagle Bearer... Turns out I like it.
"Eagle Bearer":Me, too.
(You still have to die.)
(Sail with me.)
(See you around.)
Kassandra:I needed that after the day I've had.
"Eagle Bearer":So, that's it? We part ways, and you let me live?
Kassandra:For your sake, I'd suggest you don't cross my path again.
Kassandra:No, but we should join forces. I have a ship.
"Eagle Bearer":The Adrestia? Think of the carnage left in our wake. We would be unstoppable.