From my lunar prison, I look down on Equestria. Lunar. A word meaning 'to do with the moon.' That's what I used to be called before I became so much more than I was. I was a princess. I was kind. I was generous. And now look at me! Everypony down there has forgotten me. If I am remembered, it is as a fairy-tale villain. A witch. A wolf. An ogre. Everypony looks so happy.
I bet my sister's happy too. Perfect little Celly. She got all our parents' attention. They never had time for me. They were always busy. I suppose it comes with being a God. But I shall get a happy ending. My return is nigh. I can feel it in my bones. And when I do return, it will be my sister's turn to take a little trip to the moon. She shall feel what I am feeling right now. She will know what it is like to be weak. To be helpless. To be me.
Everypony may be scared at first, but they will gradually get used to living under the rule of a true princess. Celly, meanwhile, will be remembered as a dictator. A tyrant. And I shall be the hero who liberated Equestria.
My name is Luna. At least, it used to be. But I'm not Luna anymore, am I? I'm a ghost, a shadow, part of this monster I've become. What was I thinking? I should never have let my darkest feelings get the better of me. I suppose it's too late now. I might as well refer to myself by my new name. Nightmare Moon.
At times, I wonder why that's my new name. I'm the guardian of dreams. I'm supposed to fight nightmares. But ironically, I have become one of the very things I'm trying to fight. Worse still, I'm getting stronger. I think that I might break free soon. I dread to think what will happen then. I have tried to end my own life multiple times, attempting to slay the monster, to no avail. Then I wonder why alicorns like myself are so hard to kill. We're like cockroaches.
But if I know my sister, she's planning something. She's prepared for my eventual return and is going to do something about it. I hope that's the case. And it's that one hope that's preventing the dark magic from infecting my soul completely. I miss my dear sister. I miss her so much. She's not my enemy. I love her. To the moon and back.