This story is a sequel to The Promise of a New Day

Story three of Savage Skies:
All sorts of things are brewing in the pegasus city of Cloudsdale, which is a problem for Ponyville as the one thing that isn't is a rainstorm. As the drought continues to drag on, Rainbow Dash must confront her hometown and its history, as well as her own history. But she won't do it alone, which is good, because she'll need all the help she can get.

Series starts with Foal of the Forest.
Now with a TV Tropes page.

King Sombra’s dark influence was obliterated by the Crystal Heart, and the villain is well and truly dead. But when he attempts to steal the afterlife of an innocent victim, a human spirit is left hurtling towards Equestria, where this unfortunate soul is revived into the only vessel available: the reconstituted body of King Sombra himself.

Thus, a cheerfully oblivious alien is crammed into the form of the most evil and malicious being Equestria has ever known. Not that Shining Armor and Cadence know this, of course. As far as they are concerned, the King is back and he’s lost his fricking mind.

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This story is a sequel to Foal of the Forest

Second story of the Savage Skies series:
Dawn Lightwing has overcome many trials in his life; persecution for his unique eyes, living amongst the monsters of the Everfree Forest. But now all of that is behind him. He's been adopted by Fluttershy, mended from his conflict with Applejack, and now sits poised to go to school and live the life of a normal foal. Unfortunately, Dawn's past is not so far behind him as he would like, as his experiences have left scars on his mind and heart that threaten everything he has gained since coming to Ponyville.

Followed by Storm on the Horizon.
Now with a TV Tropes page.

This story is a sequel to A Novice Swordsman in the Canterlot Court

"Everyone is a moon, and has a dark side which he never shows to anybody."—Mark Twain

Alan Williams Goldenhoof, Pendragon of Equestria, now married to the love of his life, has taken a step back from the world to enjoy life.

Of course, this is quickly ruined as the world comes to get him. Now Alan must leave behind his peaceful home in Equestria to face the rebel forces of his old enemy General Ironclaw. But all is not as it seems, for the General has a trick up his sleeve that will force Alan and his friends to face their darkest secrets.

This will get ugly.

Book 2 of the Harmony for All Trilogy.

First of the Savage Skies series.
After running afoul of timberwolves in the Everfree Forest, Fluttershy is saved by a mysterious young colt with a most unusual and disturbing feature. Realizing that he is alone, without anyone else to care for him, Fluttershy realizes that she must try to bring this lonely foal out of the forest and give him a life of love and friendship. The problem is that this colt's...unique qualities have made him more than a few enemies, including some who are closer to home than Fluttershy realizes.

Now with a sequel: The Promise of a New Day.
Now with a TV Tropes page.

This story is a sequel to A Stitch in Time

Having discovered the message left for her by Star Swirl the Bearded in the distant past, Twilight once again finds herself caught up in the middle of a struggle against forces far greater than herself. In order to even stand a chance she'll need to travel further and wider than she ever has, and forge some unlikely alliances with old enemies. All to bring down the powers that have manipulated and shaped her entire life, and retake control of her own future.

The conclusion of the Time Loop Trilogy, which began with Hard Reset
Available in Spanish thanks to dgs1993
Series TV Tropes page

This story is a sequel to To Befriend the Night

A journey of one thousand miles begins with a single step, sure, but the remaining steps are no less difficult. You are merely more determined to survive them.

A deed which, like all others, is much better endured in good company.

Coverart once again done by jjames10 (or Tome Turner).

What if Twilight was orphaned before her acceptance into Celestia's school for gifted unicorns?
what if she and the princess of the sun became inseparable? What if Twilight starts calling Celestia mommy after their lessons?
What if Celestia loves it?
Inspired by the cover photo

This story is a sequel to The Golden Armor

It's more of a continuation than a sequel, but whatever.

Comet is the leader of Princess Celestia's personal guard. Angel is the leader of Princess Luna's.

Comet is awake during the day. Angel stays up all night.

Comet likes using a halberd. Angel excels at using claws.

Comet is a pegasus. Angel is a bat pony.

Together, they take on all the twists and turns life hands them. However, things don't always go as planned.

Cover art by Equestria Prevails.
Proofread by jmartkdr and Feather Scratch

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)