It can takes the average newborn foal a day to walk. Sometimes it takes longer. Sometimes something is wrong. Sometimes a foal bounces back.

Featured by the Seattle's Angels in review #60.
From Corejo:

As a disclaimer, the prose gets a little cluttered toward the middle of the story, when he’s working on his diagnosis. All it takes is a little care in parsing the information, and you’re rewarded with a brilliant origin story that will leaving you smiling and saying, “why didn’t I think of something like that?”

It’s short. It’s sweet. It’s worth your time. And who doesn’t love little snippets of why something is the way it is in the show? I definitely do. Go check it out.

Pinkie Pie stumbles upon Twilight Sparkle's latest project and faces the consequences.

The project? Researching Sombra's horn. The consequences? Meeting the dark king himself in a battle for Pinkie's body and mind.

This is the first in the Fight Scenes are Magic series. The next is here.

The grinding gears of fate have been set into motion. One by one, the mane six have been plucked from their lives in Equestria and cast into the unknown. All except for Applejack and Rainbow Dash, that is. Now it's up to the only two remaining Elements of Harmony to uncover the dark machinations behind their friends' disappearances. Will they put aside their differences and work together?

Originally co-Written by Alex Nuage (now Ludicrous Lycan) and MerlosTheMad

This story runs parallel to the other stories in the "Madverse." Those stories are A Twilight Landing, My Little Marriage So Many Wonders, and Abhorsen by MerlosTheMad

Cover Art done by AeronJVL

Pinkie Pie is alone in a place she does not want to be. She wants to go home. She wants everything to return to normal. Pinkie Pie has to deal with the reality of a tragedy she does not want to face. Her friends, and the staff of the Psychiatric Ward of Ponyville hospital do their best to support her through this time.

Written well before Season 4 started, so expect some incongruities.

Cover art by V-D-K, used with permission.

Edit: Rewritten for hopefully an easier reading experience.

Also, if you are going to write in the comments, please use the [spoiler][/spoiler] tag. Last time pretty much everyone was giving away the ending in the comments.

Cover art by: dm29

When Pinkie chips a tooth, Twilight and her friends try to get her to go to the dentist. Unfortunately, Pinkie has a terrible dental phobia and will do absolutely anything to escape.

Story 1/22 in My 22 Short Stories About Equestria series

Rainbow Dash loses her temper and yells at Pinkie Pie, driving the talkative party pony to make a drastic promise. Now, it falls to Rainbow Dash to fix the mess she's made, lest Pinkie lose a vital part of herself forever...

A Pinkie x Dash friendshipping fic, playing at the style of an episode from the show.

When a dark enemy begins hunting the young wizard Twilight Sparkle, the walls of the fortress library of Candlekeep cannot protect her. Not even her mentor, the archmage Star Swirl the Bearded, can keep her safe. With a price on her head and the shadow of death on her heels, her only hope for salvation is the Magic of Friendship. Perhaps, with powerful allies at her side, she can find answers and uncover the truth about her destiny.

(This story is inspired by the Baldur's Gate CRPG series by Bioware, but you do not have to be familiar with BG to understand its events)

Featured on Equestria Daily
Cover by Bluest Ayemel
"I love this fic. Keep it up!" – Sethisto (on the EQD page)
"From it's fantastic character development of Twilight and fast pace and exciting action, The Sword Coast is an excellently written and well thought-out story." – Amy Clockwork

Side stories: Tales of the Sword Coast
Sequel: Shadows of the Crystal Empire
Warning: Comments contain spoilers. Proceed at your own risk.

King Sombra was not killed after "The Crystal Empire". You cannot kill that which isn't alive, after all. Instead he was reduced to a mere shadow of what he once was, barely clinging to life. But now, months after the Crystal Heart nearly destroyed him, Sombra is back for vengeance upon the ponies who thwarted him. Focusing his wrath on Twilight Sparkle, the Shadows King leaves Twilight with precious little time to solve the mystery of the mysterious force terrorizing Ponyville... And making her friends disappear, one by one...

The wheel of time turns, as destiny and history clash together.

Fifty years into the future, Sunset Shimmer is Princess Twilight Sparkle's most faithful student. She is smart and eager, but doesn't always think things through. Her life had been perfect, right up to the End of the World.

With a ruined future, Sunset travels into the past to alter the course of history. With only her mentor's cryptic word to go on, Sunset and the Elements of Harmony must solve the riddle of the Dark Regalia and stop the mysterious Vesper Radiance from rising to power. But the further Sunset goes, the more she feels like she's been through it all before.

Is destiny set in stone, or can Sunset shape her own future? Only time will tell.

Featured on Equestria Daily 6/16/13
Gratefully edited by JustAnotherTimeLord, Icarus_Gizmo, Cerulean Voice and Bad_Seed_72

The Sunset of Tropes page!

The newly coronated Princess Twilight suffers an abrupt tragedy. Having lost two loved ones, she begins to question her own mortality, and that of her friends.

AJ, Dash, Rarity, Pinkie, Fluttershy. . . they are just the beginning. Twilight will live for thousands of years, so every pony she cares about—every pony she will ever care about, will die.

She could barely handle the pain of one funeral, let alone the thought of hundreds of them. Twilight finds a clever way to ensure all of her friends never die. They can’t all be ageless alicorns, but they can all move into Twilight’s Dollhouse. Then they can be best friends forever.

Sequel: Twilight's Dollhouse 2
Fanmade Song: Twilight's Dollhouse

Source: Dreampaw
Editor: Gage of Grandiloquence, Breath of Plagues
Pre-read & Idea pony: TypeWriterError,
v1.1 Revised chapters 1-10 on May 1st 2013
--Pending a few more revisions, including ch. 14
Now on TV Tropes.