Queen of Nightmares

Twilight faced off the alicorn. She was sweating, panting, and the Elements of Harmony, were scattered over the floor. "Forget it Twilight Sparkle, I have won!" Nightmare Moon said triumphantly. "Never, will I give up on the princess, or my friends." Twilight replied. Nightmare said ," You're not serious, are you?" when Twilight bonded all the elements together. They fluttered, and then shut off. Nightmare unleashed a bolt of magic that hit Twilight straight in the horn. She collapsed. Nightmare tucked Twilight in with her and prepared to take off when a flash of light, a roar of sound, and then,  and then princess Celestia appeared.Nightmare asked, "So this is your student, is it? You sent this pony to stop me? Come now, Celestia, you're better than that."

Celestia replied,"Release her now! Your argument is with me, not her!"

Nightmare said,"Her name is Twilight, is it? A fitting name... perhaps, like the twilight, you hoped she would be the bridge between night and day?"

Celestia shouted,"I will not ask you again. Let her go!"

Nightmare coolly replied,"No. I think I'll take her with me. She is powerful; I can see why you took her as your student. I'll tell her the truth, and in time she'll see through your lies and serve me instead. She'll need a new name though... I think Eclipse will do? How does that sound, Celestia? Eclipse, just like the act of the moon blocking the sun."

Nightmare Moon teleported away, leaving a stunned Celestia surrounded by five unconscious ponies.

Celestia fell to the floor, her tears flowing freely, "I failed her, I told Twilight I wouldn't fail her, but I did." She cried, and tucked the five unconscious ponies around her, and fell asleep crying.

The next day, Celestia woke and found that she was now in her room. She stretched, yawned, and stood up. Immediate pain rushed through her eyes. She flew to the mirror in her bathroom, and saw with horrible certainty that her eyes were not only puffy and bloodshot, but were also slitted and golden. Celestia gasped and mumbled woozily, "Luna..." She stood up and walked out of her chambers. The guards at the doors were gone. A thump close to the castle door told Celestia that something was wrong. Extending her now dragon-like wings, she flew towards the sound. Nightmare Moon was there. NOW...