Funny how this comic hasn’t been updated to reflect Episode 8 & 9:
 
Grogar: I have been every voice…
 
Sombra: YOU HAVE EVER HEARD…
 
Nightmare Moon: inside your head
 
[That was from the trailer so it’s not a spoiler]

@Background Pony #8113  
Sombra: Twilight Sparkle lives! The seed of the Alicorn Princesses lives! As long as she does…hope lives in Equestria. I thought you would be the one to snuff it out. Alas, you are no Nightmare Moon. You’re just a foal in a mask.

@Background Pony #B173  
Sombra: Yes, there it is. You have too much of your father’s heart in you, young Heart.
 
Heart: I killed Shining Armor. When the moment came, I didn’t hesitate.
 
Sombra: And look at you, the deed split your spirit to the bone. You were unbalanced…bested by a girl who had  
NEVER MANAGED A SABER SPELL! YOU FAILED!

King Sombra: The mighty Dark Alicorn. When I found you, I saw what old unicorns live to see: raw, untamed power…and beyond that, something truly special. The potential of your bloodline. A new Nightmare Moon. Now, I fear I was mistaken.
 
Flurry Heart: I’ve given everything I have to you…to the Dark Side…
 
King Sombra: Take that ridiculous thing off.
 
Flurry removes her helmet.

@Revan0123  

 
Hey, look, I found it :D

@Background Pony #EB49  
Good to know someone watches The Nerd Vault’s videos as much as me :)

Flurry Heart: Forgive me, I feel it again.
 
Nightmare Moon: What is it?
 
Flurry Heart: The call of the sun.
 
Nightmare Moon: I am most displeased with your apparent lack of progress.
 
Flurry Heart: The Elements sense it.
 
Nightmare Moon: You’re destiny lies with me.
 
Flurry Heart: Show me again, the power of the Nightmare.
 
Nightmare Moon: You can destroy Celestia, the Elements and my other half have foreseen this. It is your destiny.
 
Flurry Heart: I won’t let anything stand in our way.
 
Nightmare Moon: Good, now release the bitterness in your heart!
 
Flurry Heart: Show me… aunt.
 
Nightmare Moon: You do not yet realize your importance. You have only begun to discover your power!
 
Narrator from Season 1: …the bitterness in the young one’s heart had transformed her into a wicked mare of darkness! She vowed that she would shroud the land in eternal night!
 
Nightmare Heart: I will finish… what you’ve started!
 
Nightmare Moon: Do not fail me again!

@Revan0123  
*Insert quiet but dramatic Imperial March chord

Grauntie Luna

Nightmare Moon Ghost: Pops up We have a Niece!? Squees and starts flying around the room in utter joy, screaming at the top of her lungs STARSWIRL! TANTABUS! GUESS WHAT!? WE’RE AN AUNT!