Psycho Pony Killer

Twilight awoke groggily, her vision a blur at first but then- No, she must still be asleep. Horseapples! Her eyelids fling open as she stares at the metal chains binding her in place, "Oh, feather."

A weak groaning comes from across the room and then a familiar voice, "They've captured you too, Twilight! This is all wrong. I fear...we might actually be doomed this time."

Twilight's eyes grow as large as saucers. No. It can't be, not her! "Princess?" She asks the surrounding dimness of their room. A dark form on the floor moves awkwardly into a fracture of light, exposing its owner. A badly burned Celestia lays there, two legs broken with the bone protruding. Twilight squeezes her eyes shut tight against the horrible sight of her teacher in such pain. "What- What did they do to you?"

A weak smile appears on the crippled princess' face, "Do you really want to know?" It is a rhetorical question. They both wish they didn't know, but only Twilight was spared the gruesome details of the torture her mentor had been forced to endure.

A moment of silence ensued. Twilight didn't like doing it but she had to avoid looking at Celestia like this. She kept her eyes on anything but her. Finally she broke the silence as a thought dawned on her. "You don't-"

"Know who it is?" Celestia cuts her off. "I was wondering when you'd ask actually." More silence. Whoever the killer is they must have some history with Celestia as she was finding it very hard to find the words to go on. "It's..." The princess' shoulders started shaking violently as the mighty, noble Celestia lay there broken, weeping for whoever it was. Bawling for she knew they had lost their very soul.

"Celestia, you really must stop taking this so personally." The two mares' heads snap to the left, squinting to try and make out the form in the darkness. "I did." And then there she was, moving into the light over her battered elder sister stood tall...Princess Luna.

"Luna! What have you done?!" Twilight screams, suddenly delirious with the rage she now has somepony to direct it at.

Luna points a hoof down at her sister, "What this?" She smiles, bringing her leg back down and kicking Celestia off to the side. "Fear not Twilight Sparkle, I am sure it hurt no more than crash landing on the moon!" She glares down at Celestia, her eyes furious.

"It was a mistake...Luna. Please, forgive me..." Celestia begs forgiveness to the sister she had banished, but it doesn't work like that. Luna stomps her hoof down on one of Celestia's broken limbs, twisting it to an odd angle and making the ravaged mare scream out.

"I'm sorry, forgive you? Now why would I do that?" She walks slowly back into the shadows as she talks, "No sister, that wasn't personal and neither is this. They're the same, I assure you. A princess getting her competition out of the way, because that's what we are to each other isn't it? Tell your precious little student there! You didn't banish me to the moon to protect Equestria but to ensure your own rule over the kingdom as the sole leader."

"Celestia?" Twilight asks, her voice trembling as she is unsure whether she ought to find a way to kill Luna, though bound as she is, or try to learn this new possible truth that goes against everything everypony has been taught.

A brief moment passes before Celestia talks. She tells her bound student about a princess riddled with jealousy and a thirst for power, but in this version the roles are reversed and Celestia is the sister who wanted more, who wanted it all. When Luna reappeared it was in the form of Nightmare Moon, not because she had turned evil before her exile but because she had been in battle with her sister who had indeed turned to a darker side. She admitted to how when Twilight and her friends used the elements of harmony on her it altered her memories into what Celestia had wanted. Unforeseen however was the gradual return of the true memories that lay dormant in her sister's head all this time.

"That's right." Luna says as Celestia finishes her revised history lesson for her. "Thank you Celestia, for telling the truth. It may be the only decent thing you've ever done for me." Stepping back into the light Celestia and Twilight bear witness to Luna magically levitating a black scythe patterned with stars.

"Luna wait! I want a sister now, don't you see?" Luna cocks her head to one side as she listens to Celestia. "Don't you find it odd that when you came back I didn't just send you away again? I didn't kill you sister! I wanted to start over; I still want to start over. Let me be your sister. Please! I can do it right this time."

Luna puts a hoof over her mouth, but the laugh grows and she can't contain it. "Why you didn't send me away again? Because you had your little elemental warriors fight me, when I was the only one who knew you for the tyrant you are. You weren't even around that day come to think of it, afraid I was going to best you that time around sister?" She tilts the scythe, angling the blade downwards and lets go. "And you didn't kill me because you aren't me, Celestia! You haven't got the guts."

The scythe swings full force, splicing Celestia down the middle. Cutting her from the throat to down underneath her stomach where the guts spill forth, coming up and out of the oozing mess that was once the beloved ruler of Equestria. "No!" Twilight screams as her teacher is slain before her. Her life extinguished, leaving nothing for her to do, no way for Celestia to come back.

Luna turns towards Twilight, "She sent me to the moon, so I sent her to her grave. It seems a fair trade does it not?" The trembling, bound form of Twilight says nothing, thinks nothing. She is in shock and the fear is only growing, building up and mounting. Urine trickles down the mare's legs involuntarily as the shaking terror stops and she remains perfectly still, rigid as a board she is frozen in fear. "Oh, calm down. Don't you think you are overreacting just a bit?" Luna asks as the world dims before Twilight's eyes as she begins to fade, passing out. Bound and exposed, completely vulnerable. She is open season for Luna, the killer.