I called upon the darkness of the sun and the moon and felt the power rushing into me, as Luna averted her eyes. I laughed, my eyes turning black, my horn growing long, and my mane and tail turning to flowing darkness. I aimed my horn at Celestia and started charging up a spell that will cast her into eternal darkness. Before I could release the spell, I felt a snap in my heart and collapsed. You can't control us, no one can control us. I heard the hissing voice from inside my head, and shook my head. “No, I have to, I will control you and release you when you have done as I command!” The voice, now turning into multiple voices, laugh. We will take you. We will own you and use you. You can not stop us, and those you call friend will suffer for your ignorance! The voices laughed, and I screamed. “No!” I pulled my hooves into my body and concentrated. My body returned to it's original form and the voices screamed. What are you doing? You can not contain us! I held the Nightmare Energy in for as long as I could, the voices screaming the whole time. I shuddered, not knowing how long I had held it in, and screamed. The Nightmare Energy radiated in a wave around me, hitting the princesses.
In place of Princess Luna stood Nightmare Moon, the embodiment of the darkness in the moon, liquid purple mane and tail flowing off her pitch black pelt, her slitted teal eyes staring at me. Next to her was something far worse. In place of Princess Celestia, the pony I was doing my best to dethrone, stood the most terrifying pony I had ever laid eyes on. Her pastel rainbow mane and tail had been replaced by a searing bright liquid white ones. Her normally amethyst eyes replaced with fiery gold ones, and her stark white pelt had darkened into a light gray, what you could call dark white. This must be Nightmare Sun, the embodiment of darkness from the sun.
But the worst was yet to come, as the two pure embodiments of the Nightmare Energy looked at each other, they joined each other. In a flash of magical energy, Nightmare Moon and Nightmare Sun had vanished, and in their place was the mix of the two. Half of the pony's pelt was dark white, the other pitch black. Her mane and tail were flowing in both directions, one liquid white, the other liquid purple. But when she opened her eyes I recoiled. One eye was fiery gold, the other slitted teal, and she spoke. She spoke with the voice of both Celestia and Luna. “We are Nightmare Eclipse.” She yelled, her voice echoing through the castle. Nightmare Eclipse turned her head to me, and smirked. “And you, must die.”
I fell backwards and shuffled away, Nightmare Eclipse matching me step for step, until I hit the wall of the throne room. Nightmare Eclipse stalked up to me and I screamed as she lowered her horn towards mine. I braced myself for death, but then I heard a pony blink, then heard it again, and Nightmare Eclipse vanished, her scream of rage on my ears as I was teleported away.
My white eyes shot open, my breath coming in quick bursts. It was just a dream. I thought to myself. No, not a dream, a memory. I groaned, the memory rushing through my mind again. I looked over at my black coat and black and white tail. Then up at my horn and black and white mane. I failed, and the Nightmare Energy corrupted the princesses. I went to sit up, but my vision started swimming, and I past out.