Following Discord's last escape from stone [as seen in A Pony's Sympathy], Twilight Sparkle sought to understand his role in the keeping of Balance in Equestria
Her want to understand sparked an alliance of sorts, a kind of understanding between them. Although having one pony in his corner has done little to convince the rest.
His lack of empathy and understanding of a pony's sensibility has been tolerated by Celestia.
But while both the princesses and the bearers of the Elements of Harmony struggle with even more dire problems, Discord is forced into a lesson of his own, and it could not have come at a more inopportune time.
Continuing the story of A Pony's Sympathy, the fledgling friendship between the Spirit of Chaos and the Element of Magic may determine the fate of the ponies, and the way both sides of harmony regard one another.