*Pinkie Pie steps up to Discord.*



Pinkie Pie: Discord, do you understand what you're doing?



*Pinkie Pie's path is blocked by a giant sword and Discord vanishes.*



Pinkie Pie: ...Working for Discord now? What is is you're after?



Inky Pie: World domination.



Pinkie Pie: That's not even funny!



Inky Pie: How about...revenge?



Pinkie Pie: For what?



*Inky walks away without a word.*



Pinkie Pie: Inky!



*Wings burst from Inky's back, and a unicorn's horn sprouts from her forehead. Feathers fly everywhere.*



Pinkie Pie: Whoa...



Inky Pie: I've become...a monster.



*Inky turns to face Pinkie Pie.*



Inky Pie: A monster's objective is usually world domination or revenge.



Pinkie Pie: You're wrong. Those aren't the wings of a monster.



Inky Pie: Well then, what are they?



*Pinkie Pie steps forward and catches one of the feathers.*



Pinkie Pie: Alicorn's wings.



Inky Pie: I see. Then what should an alicorn fight for, Pinkie? What do alicorns dream of?



*Inky plunges her sword into the ground and steps towards Pinkie Pie.*



Pinkie Pie: Inky...



Inky Pie: Alicorns dream of one thing...



Pinkie Pie: Please. Tell me.



Inky Pie: To be earth ponies.



*Inky bucks Pinkie in the stomach, sending her flying. Pinkie stands up in a fighting position, then suddenly drops her guard and giggles.*



Inky Pie: Defend yourself!



*Pinkie grins at Inky and shakes her head. Inky charges magic in her hoof, then stomps the ground. A shock wave travels towards Pinkie, and causes the ground underneath her to collapse.*



Just so you know, this was a Crisis Core reference.

Amazing artwork, by the way!