Celestia and Luna stood in front of a place they should've known. A place that should look like that. A place that had changed far too much.
This moment was harder for the Princess of the Night more than her sister could know. A secret held to Luna's chest for long enough. A secret that was unknown by anyone.
Celestia stepped forwards towards the darkened crystal palace. The world around this palace was desolated and cold to the surrounding, bright and green otherworld. This place had been scarred forever. Hidden under its ruler's power from ever being seen the same. The Crystal Empire was destroyed.
Luna looked up to the tower of the palace. She could sense him. Sense him close. Closer to her, yet farther in the state of mind. He had lost what he used to be. Given it all for great, and sadly, dark power. The gloom had slaughtered the love that the crystal ponies had generated into the Crystal Heart. The world was deader than ever before.
The two sisters walked towards the palace, hearts full of fear, minds full of courage on the opposed side of it all. Celestia spread her wings, followed by Luna, and they rose up towards the balcony far above.
They landed there, stepping slowly in the dark castle. The place was full of deadly hope and darkened hearts, souls of the lost hearts unescaping from the place.
"Sombra," Celestia bellowed loudly, "Surrender peacefully and we may spare your life!" The words only echoed, but were met by a deep, dark voice, "Not a chance, Princess" Sombra's voice echoed from somewhere.
"Sister," Luna said quietly, " We shall deal with the dark king, if we may." Luna's head was still low, but she raised it high in determination.
Celestia bowed her head to the smaller alicorn, " Thou may, sister."
Luna stepped deeper into the shadows, trailing up the stairway, her ecliptic mane flowing behind her. As Luna went deeper through the darkness, she sighed lightly and looked down to her body. Her stomach was protruding slightly and it was amazing Celestia was not aware of its changes. It had been 3 moons since Luna had discovered it. Long enough for her to consider her action on it. Sombra could not be the pony to help her. And for the fear of hate, Celestia was not either.
Luna would do this herself.
"Sombra," Luna's voice echoed through the shadows of the highest tower in the palace, " I know thou is here and you shant not hide from we any longer."
Sombra stepped from the back of the tower, shadows covered his body and it was barely an outline in the blackness. "Luna," He murmured darkly, " You know you can't hide it. I know you have it. You're bound to be shunned if it is discovered. You carry my offspring, Luna. Don't deny it any longer."
'I shall not deny it, Sombra!" Luna cried, her voice darkening, " But they may find out, they shall not know it is thou's!"
"So confident, for a weakling. Such a shame, so powerful, yet so hopeless..." Sombra laughed coldly.
"Weakling?" Luna questioned, powering her dark blue aura from her horn, she raised a golden box, "Thou is weaker to my power, dark king, thou's rule ends on this night!"
The box opened, the six elements floating out one by one, swirling around Luna, giving off a rainbow of color around her.
And with a flash of rainbow colors rushing toward the kind with a darkened hear, it was over. Sombra has vanished from sight, nowhere to be seen.
"And to think, we used to love thou."