A spin-off from the Sombra universe we are able to see in the season 5 chapter finale. The war ends by making a treaty: Luna would stay in the Crystal Empire by marrying Sombra, and peace would come with the end of the war. Luna&Sombra pairing
Sombra, like most self-respecting demon-gods is eager to have some fun with magic tricks, good books, and some pleasant solitude in his dreams. It's too bad his marefriend has other ideas...
Drying Paint has fallen head-over-hooves in love with a delinquent young alicorn, Luna, who just transferred to his school. He's about to find out where she goes on the weekends ... and the danger of the darkness that awaits him there.
On a casual visit to spend time her lover, Luna finds something rather startling. Sombra is in a dress. He says he can explain. How could this possibly go...?
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...
Flurry Heart starts to wonder what she is supposed to do as an alicorn. Can a new friend help with that? Even if he's the son of Sombra! While no one accepts him, she does. But was that the right decision?