Discord retells the story of his life, beginning from when he was just a young colt. How he used to be a friend to Celestia and Luna, and how he came to become the chaotic being he is now. What could have happened to change him so from the normal pony he once was?
Due to be part one of the trilogy The Curse

Image taken from Discordantly, which is awesome, by the way.

After an argument with Celestia, Luna heads to Ponyville to meet with the ponies that cleansed the evil from her. Celestia overreacts, worrying that Luna might be doing something much worse.