When Princess Celestia asks Twilight to make an official, royal visit to Romaneia, Twilight dreads the inevitable succession of dry, boring diplomatic events. The charming Lord Bela soon wins her over, but Twilight is about to discover that all is not as it seems in Bela's apparently peaceful castle. (A story inspired by Carmilla, Dracula, and other classic vampire tales.)

Written for the BadassTwilight = Total Domination Twilight's Nightmare Halloween contest.

(Spoilers in comments.)

This story is a sequel to Split Second

Twelve years ago, she broke time. Two alternate timelines exist, each with a different version of Twilight Sparkle. Both versions of her are able to see the other. In this timeline, Sparkle is a Necromancer.

Or rather, she was. Sparkle is dead now, not that she cares. She's got a new body. With Thorn (her undead dragon son) and Cobalt (her apprentice and an assassin for hire) at her side, she's ready to take on the world. Again.

(Spoilers in the comments. Read at your own risk.)

Featured on EQD.
The Tv Tropes page
The Ask Blog

This story is a sequel to Split Second and won't make sense without it.
This story also loosely shares continuity with Lupine Tree. Reading that is not required.

Cover art by Swirling Line.

Twilight Sparkle broke time when she got her cutie mark. Now Twilight and Sparkle are sisters from another time. Twilight is hailed as the potentially greatest light magician of all time, and already has a reputation as a hero by the time she goes to Ponyville. This isn't her story, not primarily.

Sparkle is an orphan - her dark magic killed her parents. She lives with her brother in Canterlot's industrial sector because they can't afford anything better. She can't leave either. She's a natural dark mage; while Sparkle won't go mad like Sombra, her reputation is hardly any better. Worse, the law doesn't see her as a good pony.

The fact that the dead don't stay dead around her, or that Thorn - Spike's double - is an undead, soul-eating abomination, are other matters altogether.

(Also has some Slice-of-Life, but fimfiction tags won't let me put it with Adventure.)

Has an ask blog to go with it: Ask Sparkle and Thorn.
Also has a TvTropes page: Split Second Tropes.

Featured on EQD.

Cover art by Swirling Line.

Fluttershy has a secret.

A dark secret.

But a certain fashionable white unicorn is on to her.

(not a grimdark story, just...creepy)

This is a 2-in-1 featuring Twilight and Sunset. The first six chapters are about Twilight's life while the remaining feature Sunset. The pair of interludes provide secondary information about events in the story.
Characters include:
Twilight Sparkle
Princess Luna
Sunset Shimmer
Mane-Six
Humane Seven (NO Sci-Twi)
Vinyl Scratch (both Equestria Girls & original)
Bat ponies (Thestrals)
Star Swirl the Bearded
There are references to the Batman Vampire comics and the Cirque du Freak book series by Darren Shan.

Credit goes to Vector-Brony

Twilight's life has just fallen apart. With basically nothing left, she's forced to move out to Ponyville just to be able to afford rent. It's there that she makes a powerful, but dangerous friend named Rarity.

Rarity is one of those sorts, who lives for indulgence and breaks rules simply for the sake of breaking them, rumors even go as far as to claim she's a vampire. Twilight had always avoided such delinquents, living her life by all the rules up until now. And yet Rarity is different. The things she says makes sense, and the forbidden pleasures she offers Twilight are beautiful.

And slowly Twilight begins to wonder whether Rarity is offering her corruption or enlightenment. She wonders how far she'll let Rarity pull her along. Hopefully not enough to become a vampire.

Popular 5-20-18

They say every fruit in the Evrefree Forest is poisonous save one. That there is one fruit that can be eaten and will grant you eternal youth and immunity to all poison of every kind. But the price of eating the fruit of eternal youth is that you can never find your way back home.

They say there are monsters that live in the Everfree Forest. One of them, the vampire, can make itself look like a normal pony to lure you deep into the woods. It is this creature alone that can show you the fruit of eternal youth.

Pinkie knows every legend surrounding these things. She knows she can stay safe and befriend one of these monsters, so long as what she's heard is true.

Warning! This story is a prequel to Final Corruption. You don't have to read that one to understand this, but it does contain a spoiler.

Rainbow Dash is feeling down on her luck one night when she meets a vampire named Coco Pommel.

It's hard to forgive yourself of past mistakes when you feel like the people you've wronged may still be harboring ill-will toward you. Sunset Shimmer desperately wants to move on with her life, to accept her new friends truly do love her for who she is, but she can't stop thinking about her past. So what do you do when you want to begin a road to healing? You go back to the beginning and find out where it all went wrong, then rebuild the bridges you've burned to bring you to a better future.

This story is a sequel to Aftermath of the Games

Change happens, no matter what any creature wishes. Actions have consequences, no matter how badly you want to ignore them. And now, magic is starting to grow in the human world in a very big way, a way that can't be hidden in a single high school.

With the inevitable coming, inhabitants of two worlds have to scramble to get a grip on what's going on before it flows out of control. Hopefully they can figure out this new magic in time to ensure a peaceful relationship between the two worlds.

Too bad there's another party interested in magic...

Check out the TVTropes page.