"Suppose I killed them all?"

I'm in a hospital bed with tubes coming out of orifices I didn't know I had. Why am I there? Why is Rainbow Dash sitting in the corner?

Why is she crying?

Diamond Tiara has always enjoyed picking on the Cutie Mark Crusaders. But one day, she finds she's gone too far, and everything for her comes tumbling down. But help may come from the most unexpected of places...

Started before season four, and does not take season four canon into account.

This story is 100% Diamond Cutters Approved!
Note: If reading this inspires you to write your own Diamond Tiara fanfics with similar premises, send me a link, as I'd love to see them.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

It's been eighty-nine days since the Day of Darkness, and Twilight Sparkle is still on her own. Eighty-nine days since she talked to anyone other than herself. Regardless of how lonely she feels, she prefers the company of herself to the vicious "lurkers", as she calls them, roaming around outside of her library. Whatever friendly, loving creatures they were before the Day of Darkness, something changed them. Something created these insane creatures, and nothing, not even Twilight, can stop them. All Twilight can do is live — live to fight another day.

In an alternate timeline, Twilight Sparkle never became an alicorn princess. Instead, Star-Swirl the Bearded's spell and the Elements of Harmony brought about the end of her life. Two months later, her friends and loved ones are still in mourning from her passing. But just because Twilight's dead it doesn't mean her friends don't see her anymore...

Don't cry because it's over. Smile because it happened.

Based upon this Flash: LINK by Swomswom
Reading by Slashawar: LINK

Practice makes perfect. And Princess Twilight wants everything to be perfect. Especially the end of the world.

I just arrived in Ponyville. It smells good. I'm hungry.

Originally written for the /fic/ mini write-off event What Lies Beneath. Coverart by JustDayside, used with permission. Thanks to Flashgen, Grif, Ion-Sturm, Present Perfect and whoever else I'm forgetting for all the feedback.