PonyALT: Black Spectrum

Twilight Sparkle. A bright young mare who lives in the library at the south end of The Eye. We join her now as she climbs the steps of the Castle of The Eye, and following her, a blue mare, her head down and eyes ahead, a chain collar wrapped painfully around her neck and white tag connected to it with black lettering that read "Trixie-28938-Twilght Sparkle". At the top of the steps, she waited. The black queen, Nightmare Moon and behind her stood the "slaved king", Sombra with a silver jeweled chain around his neck. "Twilight Sparkle, my apprentice, I expected you to be here sooner."
Twilight and her slave Trixie kneeled on their front hooves and the lavender mare responded, "My slave kept me waiting after she fell down the stairs earlier this morning, I took her to the medical facility and didn't think the procedure take as long as it did". Nightmare glanced coldly at Trixie, looking her over and noticing some small medical wrap around her back left hoof. "Hmf... you should have had the damn thing put down, Twilight", she said, "They are worthless after they are injured". Trixie shuddered quietly, a wimped escaping her lips and a tear forming in her eye. "Quiet!" Twillight yelled back at her before turning and looking back at the queen. "I know, your highness, but I can't spend another week reteaching an entire schedule to another pony". Nightmare nodded, "Yes, I see". She motioned her head toward the giant steel reinforced doors of the castle as gesture to follow her inside. Twilight and Trixie stood up and trotted behind the tall black mare with Sombra walking close to their left. Trixie glanced at the back and red unicorn. A strange aura of melancholy and loneliness flowed off of him, spreading lightly to her. Sombra turned his head to her, completely aware of her gaze, meeting her eyes for a second before silently baring his fangs at her as weak but threatening black mist formed around the horn on his head. Trixie quickly looked away and focused her gaze at the scenery of the throne room they currently walked through. The walls held large stained glass windows that depicted various different events from Equestria's blackened history. One depicted Nightmare Moon herself standing over a the corpse of a white alicorn. A white alicorn... Trixie knew of some key points in history, but that white alicorn... her name was lost in darkness that had befallen this land long ago. Trixie turned her head over to Twilght, her mistress. She wasn't like most ponies in this world, there was a bit good hidden in her heart, and Trixie was grateful to have her a an owner.
Twilight and Trixie stopped as Nightmare teleported to the top of her throne and Sombra climbed manually to his own built portion at the side. Trixie, once more letting her gaze fly freely, looked over at the two bat winged royal guards. They looked... unappreciated. Finally Nightmare revealed her reason for Twilight's required presence. "Twilight Sparkle, over the years your skills as a demon mage have progressed smoothly from the day I found you, and I believe you are finally ready for your first legitimmate test". Twilight's eyes brightened with a gleam of joy. "Yes! Anything you ask and I shall succeed, your highness". she nearly shouted before straightening out once more and kneeling back down. Nightmare smiled, "You have one day to pack your things, for you will be relocated to City-04, where there have been reports of the 'White Cult'". Twilight gasped, "Blasphemers!", she said aloud. "Yes, quite... I grant you permission to execute these corrupted ponies after you expose them", Nightmare finished speaking and let Twilight process her quest. The lavender mare thought for moment, I... I have to kill ponies... Finally. Twilight looked up at Nightmare Moon with a smile across her face, "I will succeed or die, your highness."