Twilight Sparkle has too much magic, and it will take her decades to learn to control it. Her spectacular loss of control during her entrance exam only proves that fact. She is a danger to herself and others.
 
After Sunset Shimmer’s disappearance, Princess Celestia needs a new student to bear The Element of Magic to defeat Nightmare Moon. With all of Equestria at stake, Twilight Sparkle…is not the pony she needs.
 
Princess Celestia seals Twilight Sparkle’s magic with the distant promise of one day teaching her.
 
But there are two diarchs of Equestria. Amidst a lucid dream, an offer is made.
 
“Hello, Twilight. Would you like to be my student?”