Warning: FemalexFemale. Contains spoilers.
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Chapter 1

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There she was. Lying on the ground because she was shot by a poisoned arrow. Everything was blurry, she could only make out some shadows. It was her end she believed, she couldn't move,hadn't the strenght to talk and her hearing wasn't that good, but she could hear her guild leader, Mercer Frey, saying, after looking at her on the ground.
- Did you honestly think your arrow will reach me before my blade finds your heart?
Who was he talking to? She thought. Then she saw another silhouette emerge from the shadows, she figured it was a woman, in the way she walked.
- Give me a reason to try. - said the silhouette with the most low and sweet voice she had ever heard. Who was she?
- You're a clever girl, Karliah. Buying Goldenglow Estate and funding Honningbrew Meadery was inspired. - Mercer said.
"So she is the traitor...Fuck" - she tought. "Killed by the enemy." She continued hearing them talk:
- To ensure an enemy's defeat, you must first undermine his was the first lesson Gallus taught us. - Karliah said.
- You always were a quick study.
- Not quick enough, otherwise Gallus would still be alive. "What she meant by that? Wasn't she the one who killed him?"- Firehawk was confused, but she could only think and hear.
- Gallus had his wealth and he had you. All he had to do was look the other way.
- Did you forget the Oath we took as Nightingales? Did you expect him to simply ignore your methods? - Firehawk noticed the hurt in Karliah's voice. It was still beautiful to listen to.
-Enough of this mindless banter! Come, Karliah. It's time for you and Gallus to become reunited!
She saw Mercer's silhouette take his daggers and prepare to attack, but then the second silhouette disappeared and only Karliah's voice was heard:
- I'm no fool, Mercer. Crossing blades with you would be a death sentence. But I can promise you the next time we meet, it will be your undoing.

She saw Mercer trying to find her in the shadows and then giving up as no sound and movement was heard or seen. He approached her, who was still lying almost unconscious in the ground and looked at her with hatred.
"He is here to save me. But why is he giving me that..." - her thoughts were cut short when Mercer stabbed her and left her for death.

Everything started to shine, as the darkness softly disappeared and a considerable ammount of light made its way to Firehawk's sight. She blinked furiously, brows furrowing as she was not accostumated with it and when she finally could make out the snowy pavement,she knew two things: That she was alive and that she was somehow out of Snow Veil Sanctum.
She saw a shadow approaching her from the corner of her eye.
- How are you feeling?
"That voice!" - She thought. She immediatly look up and tried to get up.
- Easy, easy. Don't get up so quickly. - The person helped her sit, by supporting her body.
- Karliah. - Firehawk uttered.

- So you know who i am, i thought you were unconscious. - Karliah said, her brows furrowed in a confused expression.
- You shot me! - Firehawk said fiercely, looking for some dagger she could be hidding so that she could kill her while she was still healing.
- No, I saved your life. My arrow was tipped with a unique paralytic poison. It slowed your heart and kept you from bleeding. Had I intended to kill you, we wouldn't be having this conversation. - She plainly said.
Firehawk's eyes widden in realization. She understood that Mercer had betrayed her and did want to kill her. Her shoulders slumped.
- Why did you save me? - Firehawk looked at Karliah in confusion and sadness and a bit of anger from being betrayed. Karliah understood all these emotions to well, as she also was betrayed once by the same man, but she simply explained:
- My original intention was to use that arrow on Mercer, but I never had a clear shot. I made a split second decision to get you out of the way and it prevented your death.
- Why should I believe you?
- Without the antidote I administered, you'd be as still as a statue. I treated your wounds and didn't leave you defenseless. The poison on that arrow took me a year to perfect. I only had enough for a single shot and yet I used it on you. All I had hoped was to capture Mercer alive.
Firehawk took this all in and finally uttered:
- Then I'm in your debt.
- More than you'll ever realize. - Karliah said with no hatred, no compromise. - All I had really hoped was to capture Mercer alive.
- Why? - Firehawk asked.
- Mercer must be brought to the Guild to answer for what he's needs to pay for Gallus's murder.
- He killed him?
- Yes. - She said no more and so Firehawk decided no to ask about it.
- How will you prove it?
- Huh ? - was Karliah's reply.
- How will you prove that he murdered him?
- My purpose in using Snow Veil Sanctum to ambush Mercer wasn't simply for irony's sake. Before both of you arrived, I recovered a journal from Gallus's remains. I suspect the information we need is written inside.
- What does it say?
- I wish I knew. The journal is written in some sort of language I've never seen before. - she answered sincerely, with a hint of sadness in her voice.

She didnt like the look of sadness that Karliah had on her face so she suggested:
- Maybe it can be translated. - Karliah's eyes widden in realization and she finally let out a smile. A smile of hope.
- "Enthir... Gallus's friend at the College of Winterhold. Of course... it's the only outsider Gallus trusted with the knowledge of his Nightingale identity.
- That word "Nightingale"... What does it mean? - Firehawk asked.
- There were three of us. Myself, Gallus and Mercer. We were a anonymous splinter of the Thieves Guild in Riften. Perhaps I'll tell you more about it later. Right now, you need to head for Winterhold with the journal and get the and get the translation, take these as well, they may prove useful for your journey. - She took Firehawk's hand in hers and placed there four doses of a leveled poison,while her other hand she closed Firehawk's own, making her grip the four doses.

They looked in the eyes,both silent.
- You will not come? - Firehawk asked.
- I'm afraid not. There are preparations to make and Gallus's remains to lay to rest.I promise to join you there as soon as I can. - she smiled a sad smile.
Firehawk nodded and proceeded to go to Enthir in Winterhold, wondering when she will be able to see the Dark Elf again.

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Continue.
A/N: I'll post little by little. I have much more already written but i decided to make little chapters. I appologize if in the beggining it's kind of tedious, because its mostly the actual speech they have in the game, but i wanted to make this realistic and later on it will be different :)