The princesses gave their magic to Twilight to prevent Tirek from stealing it. As a result, they end up stuck in Tartarus. The fact that things manage to go downhill here says a lot about the wonders of family.
Each time Twilight tries to stop Starlight, she fails and is flung to a new, twisted Equestria, each one worse than the one before, until she lands in one that isn't worse. The only real difference is that her castle isn't there. But the library is.
What if Twilight had been born an earth pony and not a unicorn? No school for gifted unicorns, no burst of magic when she got her cutie mark and, most importantly, no student of Celestia. What fate awaits Equestria?
An impossible creature finds herself in a world which already knows everything about her. Slowly, she learns about the true nature of her own reality, her world's place in the cosmos, and herself.
After the Crystal Kingdom was transformed into a desolate wasteland, Atlas and his friends safely arrived in Equestria. They'll have to make a new home for themselves, while Atlas tries to master the magic passed down to him by the gods.
It is a century after the war of the two cities, a time when the line between pony and machine is becoming blurred. And yet, even now when ponies are connected in so many ways, something wants to disrupt the fragile network of society.
Thanks to the love bomb at the Royal Wedding, Princess Celestia is revealed to be a Changeling Queen. How will Equestria, deal with this? And why is Celestia a Changeling Queen in the first place?
The first chance was little more than a frail shadow. Now, she has a chance. Now, she can do it again. Ponies need to be saved and Twilight Sparkle is just the pony to do so.