Fate/Stay Night: Moon's Cry

"Your Highness. Why are we doing this? Why do we have to betray King Arthur?"

—"The Arthur now, is not the Hero we knew. He's not the King I married."

"What are you saying?"

—"King Arthur is now being possessed by Morgana. And Merlin took side with her."

(Guinevere sits down on a chair)

—"The Grail. That Man told me. He said, Morgan le Faye plans to incite a war against Humanity by invoking a Demon inside the Chalice. If that happens, our World is in grave danger."

"Morgan le Faye. The Woman that appears in your Wedding. The Woman brought by Merlin, the Wizard?"

—"Morgana is my Sister. She's my Twin. And I doubt, Merlin is being controlled by her using me."

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Inside the Walls, King Arthur shut down the gates, not letting people goes out of the Kingdom.

Inside the Palace, 10 Knights are present standing before the Throne. King Arthur is Sitting on it and beside him is Morgana also sitting on the throne. And Merlin standing beside them.

"Where is Lancelot? Why he's not here?"

—"Your Majesty, Lancelot took a stroll outside the Palace, yesterday. He haven't returned yet."

"And my Wife?"

—"Is she not sitting beside you, My Lord?"

"Didn't you mistook someone to be my wife?"

—"My Lord?"

"My Sword. Lancelot... He stole what is belongs to me."

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" I thanked him for freeing me from the Sword. I gave him power to fight against Evil. We protect people to fight demons. But now, We are being controlled. King Arthur. That's the reason I have to escape from him. I am his Sword. If he got me, it's impossible to defeat him."

"What are you talking about, your Highness?"

"Now, the Sword finds a new owner. Lancelot, from this day, I am now in your possession. From this day, you've become the traitor of the empire. For the sake of the people inside the Walls, we should protect Avalon and fight Demons."

"Faye. Lancelot. Your presence here is important for saving lives. Our Enemy is not an ordinary beings. They are powerful Demons."

"Who are you?"

"I am Elrich. An Alchemist."

(Elrich, Another Archer's Identity of Heroes)