Title: The Darkest Side of the Moon.

Main characters: Princess Luna, Nightmare Moon.

Genre: Alternate Universe, Dark, Romance.

Pairing: Nightmare MoonXLuna.

Premise:
In the Mirrorverse, the tyrannical ruler Luna has grown tired of always being second fiddle to her sister. However, during a raid on King Sombra’s castle her knight’s bring her an interesting mirror that he had acquired. Luna decides to research it and keep it a secret from her sister.

One night the portal opens, after entering it Luna finds herself in a completely different Equestria where the Moon seems to never set. She soon encounters the ruler of this Equestria; Nightmare Moon. At first, Equestria think’s she is a imposter, however she backs down when Luna reveals her knowledge about the Mirror Portal. Nightmare Moon reveals that in her Equestria she successfully staged a coup against sister, banishing her in the process and bringing forth an era of eternal night.

Luna is shocked and delighted to see what a world under her rule would be like and decides to stay and explore the new world. Unaware that her counterpart has plans for her...