Little Star Chapter 1
Thankfully, her time in the sun actually gave her some rest, because she had yet to sleep since twilight managed to release her from nightmare moon's grasp.
Lunar Lament - Chapter 3: Desperate Times
She takes once glance back at her brother, who is now staring down nightmare moon as the dark alicorn stands up. she whimpers softly and looks forward again, unable to look at what's going to happen next.
Princess Luna - Chapter 2
"_ then, to nightmare moon, she softly uttered, _'uh, no offense...' **'none taken...'** _ came the subdued response of her dark alter ego.
MLP FiM Family Reunion
"nightmare moon also killed so many ponies before odin was even conceived, nightmare moon was a murderous monster-" luna took some offence to that, but realized what celestia really meant.
Lunas Diary
moon was born.
Nightmare, Nightmare Chapter 3
One of the best perks of being nightmare moon. the freaking clones.
Nightmare, Nightmare Chapter 1
A quick look showed it was deserted and strangely nightmare moon themed. but those statues depicting nightmare moon were utterly creepy. but it was a good place to set up shop and be in her true form in safety.
Death To Nightmare Chapter 4
Many of you believe nightmare moon has returned. as you can see by dear sister luna is right here, not as her alter ego nightmare moon. besides from nightmare night she does not don that persona's form at all.
Lunar Lament - Chapter 2: Moonlight
You cannot kill nightmare moon!" twilight clenches her jaws shut in disbelief. this can't be happening!
Death To Nightmare Chapter 5
"ma'am i saw it myself, nightmare moon is back but she isn't acting herself. she saved that airship and did a speech i would have expected to see princess twilight or princess cadance spout."
Little Star Chapter 4
'nice move, tia,' she thought, firing several bolts at her sister, causing celestia to break off from the attack and give momentum to nightmare moon.
Shadow of Loyalty Chapter 5
Unlike others, you did not fear me, not even as nightmare moon. you are as important to me as my sister. if you ever need help, please let me know.