As a Royal Princess, it is Luna's responsibility to watch over the subjects in her kingdom. One of the ways she helps the common pony is to inhabit their nightmares, helping them to overcome their fears and anxieties in order to live stronger the next day. However, one night Luna steps into the dreams of a young filly and finds out that the pony is dying. With nopony else able to help the child, the Royal Princess realizes that she has no other choice but to help. Can Luna save the filly walking the line between life and death?

It is the year 2038, and the Earth is slowly being consumed by a space-borne monstrosity dubbed the Black Tide, which is using nanotechnology to remake the planet into something hideously alien.

Erin Olsen works for Project Harmonics, humanity's last-ditch effort to find a new world before the Tide can wipe them out. But when that world is found, and it turns out to be occupied, Erin will need to find the courage to face the unknown in order to save the inhabitants of both worlds.

(Many thanks to Easteu for the fantastic cover image for this story!)

Now with its own TV Tropes page

There is now a follow-up to this story: Sunflower - Side Projects
Sequel: Project Sunflower: Harmony

Humans... humans are such a bizarre race. Capable of the greatest benevolence and the worst atrocities. And yet, they're so very predictable. For you see, while societies may die, and nations may crumble, one thing will remain constant: the desire to survive.

I should know. I was there when everything fell.

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?

When the whole brony thing started, few shippers wanted to ship Fluttershy & Big Mac. I'd like to think this fic changed that...

Necromancers. Sickly ponies bathed in cloaks of darkness, bringing ruin to all who fall under their shadow, terror to those who meet their gaze. Ripping the dead from the grave and conscripting them to their army of evil and conquest. Woe to the towns that dare draw their interest.

Such are the legends.

This is a story about one of the kindest ponies I know.

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Now on Equestria Daily!

Now with a sequel, From Dusk to Night.

Beta Reader Special Thanks:

Blissey1
Clever Pun
Japanese Teeth
Pannic
Meta Four
Sereg
Connelly
Invidlord
Jezendar
TerribleTransit

Pinkie Pie is being tormented by horrific nightmares. Unable to deal with it by herself anymore she seeks out Twilight's help, but will it have been the best decision when she finds herself alone in an abandoned, fog filled Ponyville?

Sequel: http://www.fimfiction.net/story/4676/Too-Shy-for-a-Rainbow

There have been a LOT of high-quality readings of Silent Ponyville, but this one is my personal favorite:
https://www.youtube.com/playlist?list=PLGh01rbB4o3xoSV7a6Omc-UJROXHRZ1Hv