After a millennium in exile, Princess Luna wishes to reflect on the actions that led to her banishment as Nightmare Moon. Those actions include adventures long forgotten, secret wars fought by devotes ponies, the advancing of magic unrecorded, and relationships that toil with the future of ponykind.

To most of Equestria, these are old pony tales, myths of the past, legends of a different time. For the two princesses, they are the stories that changed their kingdom forever. This is a tale of uprising and submission. Harmony and deceit. Knowledge and corruption.

This is the origin of Equestria's greatest threats. This is the story of Breakout.