Luna, with the reluctant help of Nightmare Moon, sets out to remedy her past mistakes and return the sun to Equestria. Meanwhile, Queen Chrysalis tries desperately to save her species.
The Black Company claims to not remember Nightmare Moon, but they fly her banner under alien skies far from Equestria. And the stars are moving slowly towards their prophesied alignment...
700 years have passed since the night Nightmare Moon defeated her sister Celestia and cast her to far off lands, stripping her of power. Now, the hate in the younger sister's heart has faded, and she has brought Celestia back to Equestria.
The Nightmare, a monster that prey's on the weak and defenseless. A monster which devours newborns and curses the innocent with nightmares. That is how most would describe her. Her creator looks at it differently.
Six stallions must use all their willpower in order to harness powers of Elements of Harmony and stop Nightmare Moon from casting an everlasting night.
Luna is prepared to what no pony has ever done before and weave magic raw with all that burns within her to forge a way to escape the ostracism she has endured. She cares not what she does to remove her shackles in order to save all.
She looked just like Princess Celestia, except marred and broken. Her ceremonial barding had rusted slightly. Black streaks ran through her mane. Worst was the scar across her chest. The tarnished Celestia smiled at Luna. "H-hello, monster."
Nightmare Moon won. Which isn't too bad since she's merciful(er than expected), is willing and wanting to learn of this new era, and is willing to compromise the "Eternal Night" plan if she can't make it work.
After being banished, Nightmare Moon finds she is able to talk with Discord, also sealed away. The two despise one another, but talking with a hated foe is better than endless monotony. Over time, the two fall in love, up until tragedy strikes.
Nightmare Moon spent a thousand years alone. After returning and overthrowing her sister, she finds a possible companion in one of the ponies who sought to defeat her. Now Rarity must fight alone to retain her sanity.
After being defeated by the elements of harmony, Nightmare Moon wakes up in a strange new world. Meanwhile, the Windigos and King Sombra attack Canterlot.