“Who disturbs my plasma bath?!?”

Sombra; Welcome, Twilight Sparkle.  
Twilight: Who said that?  
Sombra: I am King Sombra.  
Twilight: Show yourself.  
Sombra: I summoned you here for a purpose.  
Twilight: Nopony summons Twilight Sparkle.  
Sombra: Then it pleases me to be the first.  
Twilight: State your business.  
Sombra: This is my command: you are to destroy the Crystal Heart. It is the one thing, the only thing that can stand in my way.  
Twilight: You have nothing to fear. I have already crushed Princess Cadance with my bare hooves.  
Sombra: You exaggerate.  
Twilight: The point is she’s dead, and the Crystal Heart died with her.  
Sombra: No. The point is you are a fool. The Crystal Heart has been passed on to their new leader, Shining Armor. Destroy it for me.  
Twilight: Why should I? What’s in it for me?  
Sombra: Your bargaining posture’s highly dubious, but very well. I will provide you with a new body and new troops to command.  
Twilight: And?  
Sombra; And nothing! You belong to me now.  
Twilight: I belong to nopony!  
Sombra: Perhaps I have misjudged you. (horns starts to glow) Proceed on your way to oblivion.  
Twilight: NOOOOOOOOO! I’ll accept your terms! I ACCEPT!  
Sombra: (horns stops glowing) Excellent.
 
(the transformation begins. Suddenly Twilight is glowing green, and her body starts growing slightly, and the most noticeable change are the pair of wings on her back)
 
Sombra: Behold: Twilicorn! And these shall be your minions. Skyla, the tracker, and her huntsmen, the Parasprites. Spike, the warrior and his armada. And this shall be your chariot. Now go and destroy the Crystal Heart.  
Twilicorn: I will rip open Shining Armor and any other Crystal Pony until the Crystal Heart has been destroyed.  
(Twilicorn hops on the chariot, pulled by Spike’s armada)  
Twilicorn: To the Crystal Empire!  
Sombra: Destroy the Crystal Heart.

@Background Pony  
…that’s what I said…

This comparison is wrong Twilight is more like Hot Rod becoming a Rodimus prime

“Ponytron and all it’s moons belong to me!”

So she gets even crazier?

…I woulda thought it’d be more like rodimus prime…

Actually, wouldn’t it be more like the time Optimus strapped Jetfire onto his back?