It doesn't matter.
Destruction.
You raise the moon the way you always do, or always did, in this case. It doesn't really matter anymore. You look up at it, the very reason of your existence. Your special talent. It's not what it used to be, cracked all over the surface, and missing a third of its mass. It still glows bright white. Well, there's a tinge of blue, but it's not really noticeable to anyone but you.
And since there's nobody else but you, it doesn't matter.
You start making your way up to the palace main entrance. The landscaping outside remains pristine. The grass is still green, the flowers only just starting to wilt. You wonder how they didn't suffer a scratch from the battle, especially the end of it. You would've thought that your final blow might've turned everything on this side of the planet to dust. Not everything it seems.
Just mostly everything.
You're halfway there, and you look back. You can see over the smashed remains of the walls and massive gate that once guarded this place. The absolute destruction you brought down was its undoing. The jewel of Equestria, turned to ash by your power. Only three things stood upright in all of Canterlot, the self proclaimed "safest city on the planet", when you returned here. Only two now, for when you saw the statue of you and your sister standing tall together in town square, you could not bear the sight of it.
You smashed it into pieces.
The city was a bit of a heartbreak. You picked through the rubble a bit to see if anything survived, and when you tore apart the layers of rubble, you found out that you were digging through a destroyed orphanage, in which none of the occupants in the building were alive. You wanted to shed a tear, but you didn't. It doesn't really matter anymore.
What you did do, is found how extremely annoying it is to walk everywhere. You cursed Twilight and Rainbow Dash, for they had been the ones to take your wings. You remember the pain well. It's alright though, their pain was far greater.
The other two buildings were the northern tower of the castle, and the mountain, although the the mountain looked a bit thinner. You just made it past where the grand doors would be, and you even found one of them in only a couple of pieces. You walked into the great hall and down to the end of it, through where another set of big wooden doors would be.
The throne room.
It was still there. A bit dusty and discolored, but still there. You walk over and sit in it, taking in the view. This was where it started. When you returned to this room after one thousand years, you noticed you still had a hatred for your sister. When the elements purged Nightmare Moon from you, it didn't work.
At least not completely.
You were wholeheartedly happy when she was gone, but you soon learned that she still inhabited your body. Just only in your dreams. Or nightmares, that is. You didn't tell Twilight the whole truth when you said you created the Tantabus. It was partially you, partially the nightmare. The nightmare's spirit and power was put into the abomination, as well as your own power. That wasn't enough though. You contributed the final piece of the puzzle, the one that would mould the beast into something else. Something dangerous.
Your fear. Your essence. Your soul.
Yes, this was the final deal. The handshake that would seal your fate forever. You smiled when she told you that you would win. She told you that if nothing mattered to you anymore, then you could win. In the end, you had the trump card.
When you finally transformed again into something new, the response was immediate. Backup was needed. Celestia weeped. What a coward. Twilight and her friends were called. Rainbow power was used against you. It didn't work though. You were too strong. Too fast. Too powerful. You just needed to take out the weak links to make the whole thing crumble.
You remember Fluttershy's blood on your hooves, and the absolute fury that her friends felt after it.
After warding them off for a bit, you announced your plan to Celestia. She recoiled but decided that it was time to take action. She tried to strike you, but it was slow. Pathetic. You launched her into the earth, smashing part of the castle as you did. It was then when Cadence arrived with backup.
Everyone was there. Your sister, Cadence, Twilight and her friends, every single member of the high council. Every one. They had taken creatures of Tartarus out to help. Tirek, Falkhannr the Red, The Dark One. Legendary heroes from all over the world appeared. Even Discord had showed up.
Your mother and father were there too.
You flew away. You fled as fast as you could, and nobody could catch you. They still followed. You didn't want to be in Canterlot for that fight. It would get ugly. You stopped when you reached dragon country. Might as well fight there. They reached you a half a minute later.
They tried talking, tried convincing you of another way. They stopped talking when you killed three of them. Just like that. Applejack was gone, Tirek was ash, and an Alicorn of the high council was gutted in front of them.
No more talking.
You fought with everything. Earlier, you had surprise. Now they were on the defensive. It was difficult, and you were losing. This much firepower you could not take. Mother and Father finally grabbed you, but you would not lose. Twilight and Rainbow Dash took your wings, but you would not lose. Everyone else was firing away at you, to suppress you. It didn't matter. Your sister and Cadence were crying when they sucked all your magic away. It didn't matter. You would not lose. You still had some magic. Your alicorn magic. Your talent.
Your moon.
You reached out to it, and it responded. It was eager to serve. So eager. You told it you were sorry that you were going to hurt it, but it didn't matter. You mustered up all your strength before you were going pass out. You wanted to be one with the moon. And so you were. This was your trump card. The moon became you, and you became the moon. You were the moon. You are the moon.
And you brought yourself down on the world.
After that, there was nothing. The crater was enormous. The earth was shattered. Cracked in every direction. You had no more magic, besides your ability to raise and lower the moon. You got up and started walking back towards Canterlot. There were earthquakes and volcanoes, the world was tearing itself apart.
It took you a week to return. Everything had settled by then, except for the ash. If your moon didn't kill everything, the the lack of clean air and sun would.
You didn't care. You don't care. You won. That's all you wanted.
You made your way up to the northern tower. It was your tower. You climbed the stairs to the top, and opened your bedroom door. Things were a mess, but you cleaned it up. Everything back in its place. You stared outside your window for a while. Your moon was still high in the sky, and you had no intention of putting it back down.
Ever.
You walked to your bed, got in and closed your eyes. You did not sleep, for their was someone calling you.
She told you that it was over. You both had won.
Both?
You cast her out of your body, a deformed monster without a shell, a hideous fake that thought she could use you. You obliterated her.
Not both.
Just you.
You looked outside your window again, and waited for something. Waited for something in a world full of nothing.
A world full of death. Of rubble.
Destruction.