Magic, the most powerful of the Elements Of Harmony, it binds them together and helps keep stability over Equestria. Cut that off and what happens? What happens when the threads of friendship are severed, and the flames of chaos are rekindled? For Twilight, her existence's end is simply the beginning to something much bigger. How will she act in a world deprived of the harmony it once held as a creature that must thrive on the blood that Equestria has lost?

Canterlot... For centuries, Canterlot was the shining gem of Equestria, the pinnacle of pony society. Now, it’s a reminder, a bleak and monolithic warning to the world. 

Changed by the chemical and technological poisons that plague the mountain, an abomination of nature, I wander the greatest disaster Equestria has ever seen. 

... I will escape eventually, and when I do, I hope my friends still see me as Twilight Sparkle, and not the monster that hides among the ruins. 

Though the distance between Pinkie Pie and her five closest friends has grown in the half-century since they claimed their Elements, she does what she can to prevent the others from drifting away. It’s small things, mostly: tea with Rarity, a drink with Rainbow Dash, a few words with each of the others. The friendship still makes each day together magic, and she works as hard as ever to bring cheer to all of her friends. When the smiles come less frequently, that just makes each one that much more precious.