This story is a sequel to Lost into Shadow

Twilight has failed, or rather, she has succeeded. Her darkness is her power, and together with her husband, Queen Twilight has a new plan for all of Equis. The black castle rises to greater power than has ever been seen before. War is brewing while alliances are forged and others are broken. The days of harmony are dead and gone, and all the world will be forced to mobilize against the might of the Nightmare Hordes. Will they prevail in the faces of Wrath and Despair? Do they have any hope of someday returning to a time of peace and love?
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Not a chance, because in Chapter 1, Hope dies.

This story is a sequel to Monsters

You might think that Equestrian nights are but serene exhibitions of Luna's work on the sky. You may believe that you can just lay out on the grass and admire the beautiful stars as a warm evening breeze caresses your mane. And you would be wrong.

Equestria is a magical place, and where there is magic, there is chaos. Dead rising from their graves, inanimate objects coming to life, strange apparitions making your foal cry in her room... sounds familiar? No? Then I'm doing my job right.

I'm Twilight Sparkle, and I work the Night Shift.

This follows canon up to the end of season 2.
Check out the Fanart Repository for lots of awesome Night Shift art!

Featured on Equestria Daily.
Winner of Stories Back from the Read 2013.
One hundred percent approved by Twilight's Library!
Special thanks to Nonagon and Wise Cracker.

It never meant to happen; it never should have happened. It was obvious that no one knew, nor was ever supposed to know. But becoming a princess gives you some insight, and the reason for my transformation soon became very clear. Princess Luna was dead, and I was to going to give her life.

A slice of life as Twilight learns that becoming a princess is a lot more than she bargained for. (Note: This is written immediately after the end of Season 3. Cover art is Mandala by Whitestar1802 - http://whitestar1802.deviantart.com/art/Mandala-355858836 )

Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.

After an unknown accident Twilight Sparkle and Rainbow Dash awake to find themselves sharing the same body! Now they must struggle to hold themselves together as their world is turned upside down. How long can two ponies exist in a single mind? It’s a race against time as they search for answers before it’s too late. When all is said and done, you’ll never look at Twilight Dash the same way again.

To many ponies, Twilight is a bookworm, friend, and master mage. In light of recent events, now princess, too. But princess of what? Celestia says it's the stars, but when Celestia's statement is tested, will it hold true? Maybe, just maybe, Twilight has a different meaning after all...

After an accident, Rarity and Twilight are thrown in a race against time to stop their transformation into changelings before they become part of Chrysalis' swarm forever.

This story is a sequel to Lost into Shadow

The impossible has happened, through all the pain and darkness, Twilight Sparkle succeeded in her impossible mission...mostly. King Sombra is still plenty rough around the edges, but despite being an old dog he's making an effort to learn new tricks. Where will this new way of life take him? He has absolutely no idea, but with his queen to guide him, what could possibly go wrong?

It is the thousandth year since Nightmare Moon's banishment and she has returned. When the battle with Nightmare Moon goes awry, Twilight's friends and family must cope with the destruction left in Nightmare's wake.

Note: This story is based off of the picture giuliabeck's You Are Mine and Sparkle No More.