Set 14 years after Day of the Moon, Crescent is all grown up and is part of Luna's elite guards. Everything has been going smoothly for them. Crescent has made friends with the Cutie Mark Crusaders and has been taught the highest level of magic by Twilight. Nothing could be better.

2 years later. Equestria has turned into a dictatorship. Celestia has seized control and her sister is powerless to stop her. Crescent is sent on a mission to eliminate both Celestia and her associates while Luna gathers enough rebels to revolt and take down her sister. Amongst the chaos both factions attempt to uncover an ancient artifact that could bring about the end of the war. What is this artifact? How will it affect Equestria's already unstable state? And will Crescent and Luna be able to take down Celestia? The answers lie ahead beneath the moonlight.