Sombra, Nightmare Moon, Chrysalis. Three of the most nefarious villains of Equestria. But once, they were simply teens who had lost their way in the world......
Princess Luna disappears from Equestria with hopes of saving the world and is accompanied by the enigmatic Sombra. Meanwhile, Celestia tries to bury secrets as immortal as she is and Cadance must choose her loyalties carefully...
After the Crystal Empire is freed by Twilight and her friends, Luna realizes she must say a final goodbye to someone she thought had died long ago. Deep in the caves beyond the Empire, he waits for her.
A year has passed since the fall of the Crystal Empire. As a new threat looms over the land, Luna begins to wonder if she too will soon become an enemy of Equestria and her sister.
When two unlikely ponies, Luna and Sombra, meet beneath the silver moon, will their love be everlasting, or will the darkness lurking in the Crystal Empire succeed in destroying them?
Regretting their last encounter, Sombra wishes to try to make things up to Princess Luna... but isn't the rule "once bitten, twice shy?" He has a long way to go...