Her story is known, her defeat & destruction, and Princess Luna's happy ending...
Though, It in fact was not the end, just the beginning for Nightmare. As those that don't perish, often grow. Whether it's for good or ill is dependent upon the circumstances. These particular circumstances resulted in her becoming a complete pony of her own. Ever thankful of the new friend that gifted her that which she was missing, she persevered.
Into the future that she had built, the ponies that she brought into the world, the new family she made, and eventually the 'empire' (collection of colonies really) that her ponies forged amongst the stars. Far far from Equus.

However, with such growth comes longing. Ponies have an inherent desire to see their families, old and new. Now that she is one, the desire to really know them and love them has long awakened.

'Since Mother and Auntie are alicorns, they must still be alive out there...somewhere?'

With so much that she needs to apologize for, so much to say, so much to know... the day she can see them again just cannot come soon enough. However, it's been more than 9 centuries now, that they thought she was only a thing, and destroyed at that.
Her wait is at an end, though there are always bumps in the road of life.

Though this story is set upon Earth, there are only ponies there now. The world 'building'(unwritten prequel) is a slightly apocalyptic one. Which could even be considered a bit of Nightmare's penance; to have to helplessly witness the end of a civilization (and side step being swallowed up by), in order for her to get a second chance & a clean slate to make her own future. Not everything was lost of them however. After all, where would the idea's of advanced technologies have come from otherwise?
Prequel here: The Early Days

This story takes place many centuries after, in better days.
Part 1; is the lead up to the reunion, and world building. The other princesses do not yet appear (tags adjusted). Also re-rated teen due to married couples (slight comedic romance)

Starlight Glimmer destroys Equestria when she learns how and why she actually lost her soulmate, Sunburst. Trying to fix her mistake, she learns time travel done right can lead to a revelation of the heart—and maybe even to the renovation of harmony itself.

A more challenging route to possible redemption for Starlight Glimmer in The Cutie Re-mark.

This is not a sequel to Lesson Learned, but Bedroom Interlude is a sequel to this story. The backstory in this story inspired The Enforcer and Her Blackmailers.

This story is a sequel to Rediscovering Harmony

Starlight Glimmer has returned to the present to find herself a member of the Mane 7. She is now a bearer of an element of harmony, and has a husband—her soulmate, Sunburst. So, what happens the morning after?

Though a sequel to Rediscovering Harmony, it is written so it could be readable standalone; It does contain spoilers for the first story. Artwork (c) by Tambelon at Deviant Art.

This story is a sequel to Phoenix-born rising - the ascension of Sunset Shimmer [1st ed.]

The rite of the phoenix is one of the most celebrated moments among the sun-gazers of Solaria. For with the hatching of a new phoenix, comes the ascension of a new phoenix-born: a mortal chosen by the phoenix to be its new life partner and guardian. Only those with both strength and purity of their inner fire can draw the attention of a hatchling phoenix, so only the best of the best can ever hope to be chosen.

To one young orphan girl named Sunset Shimmer, she could only dream of witnessing the ascent of one of Celestia's chosen. As the day approaches, she learns that she will be able to, as she has been selected by the crown as one of the girls to serve at the event.

Little did she know that this would be the seminal event of her life, and change her fate forever.

Book One - The Choosing
Book Two - The Trials

Original abridged version was my entry into FanOfMostEverything's Imposing Sovereigns II contest. This is the expanded, full version.

Cover art by me.

Grammar and editing provided by ArgonMatrix (Up to Ch 7 of the Trials) and Incandesca (The Trials Ch 16 and on)

In Equestria, there are four princesses: Princess Celestia the Wise, Bringer of the Day and Protector of the Light; Princess Luna the Brave, Bringer of the Night and Protector of Dreams; Princess Cadence the Just, Bringer of Love and Protecter of the Crystal Heart; and Princess Chrysalis the Resourceful, Bringer of Peace and Protector of the Library of Wisdom. All four of them have proven time and time again their worthiness of the titles of Wise, Brave, Just, and Resourceful.

But rumors exist of a fifth princess: Princess Twilight the Kind, Bringer of Friendship and Protector of Magic itself. The rumors tell that Princess Twilight had five loyal friends, who together represented the fabled Elements of Harmony, using them to heal Luna the Brave, Chrysalis the Resourceful, and fabled mage Starlight the Powerful, along with many others.

But one day, Princess Twilight’s five friends and Princess Twilight herself disappeared, never to be seen again.

Now, the only clue as to her whereabouts lay in The Frozen Empire and it’s empress, the mysterious Winter Goddess, who communicates only by messenger even in times of dire need. The four Princesses have tried time and time again to talk to the Winter Goddess directly, but have made no progress.

And then, the Winter Goddess herself appears in the Throne Room, intent to call a Council of Royalty to discuss a new movement called the Eastern Ring.

Edit 2/27/20: This story's been featured. :)

The Changeling General, war hero, driven to win at any cost. The Moon Princess, Equestria's guiding light, seeking to protect her ponies from an unseen threat.
Between these two, a secret war was waged. Between these two, stood a young changeling princess: Chrysalis
Born of a different color from her mother's hive, Chrysalis finds herself being drawn towards the center of the conflict. With those she holds dear backing her, she'll march into the heart of this war, changing the fate of her race. For better, or worse...

Set in the Trio-verse, an AU where Celestia was banished, instead of Luna. No prior reading required.
Want to give my most sincere thanks to Seiya, Llyrisviel, and docontra for their help editing this tale.

This story is a sequel to Luna's Protégé

Growing up is an adventure. Especially when it takes place under the tutelage of Princess Luna! Under her care, Twilight, Trixie, and Sunset are now friends. However, they're not quite PBFFs, yet. And since they've barely begun being Luna's Protégées, there's still a great deal left for them to learn.

Naturally, since they're still fillies, there will be some missteps, mistakes, and even the odd problem or two along the way. But, it's nothing they can't handle, as long as they have each other!

Direct sequel to Luna's Protégé
Set in the Trio-verse.

When her 'brother's wedding day comes, she thinks of nothing but that it will be a drag. But when Twilight discovers that her mother is undercover, Twilight is happy, knowing that maybe the wedding won't be as bad as she expected.

Applejack couldn't help but notice that Twilight has been acting weird all the time. Will Twilight be able to keep up her cover or will everypony discover the truth before she and her mother can begin their plan to attack Canterlot?

Princess Twilight Sparkle and her friends have faced endless troubles while ruling Equestria. There's never been a challenge they could not conquer.

But the end of the world has come, and nopony can stop it.

Contains narrative that jumps ahead into the future, several original characters, a despondent princess, probably some crying, and the magic of friendship.

A huge thank you goes out to Semillon, who beta read this story and provided some invaluable critiques.

This story is a sequel to Seven Years

Family had always been a strange notion to Princess Skyla, and anypony who knew her history would never wonder why the filly had such a vague grasp of the concept. Every memory she had of her family was tainted and dark, the photographs of her life smeared and marred by the decisions made by her mother and father, and she couldn't remember a time when she could even think about the word "family" without a black veil of disgust and sadness drawing over her heart. As such, family was never something that Skyla had ever given much thought, unless it was how she was going to get away from them.

Now, however, family is all Skyla can think about. Princess Cadence and Shining Armor have welcomed her with open hooves into their home, and their daughter, Princess Flurry Heart, is overjoyed to suddenly have a "big sister" to learn about and play with. She hasn't been officially crowned a Princess yet, but despite that the whole of the Kingdom is abuzz with news of her, and all of the Princesses of Equestria have all set aside time to come and see her for themselves...

...but try as she might, Skyla can't shake the feeling that something is wrong. Not with anypony else... but with her. She doesn't know how family is supposed to act around each other when they're not trying to scheme and stab you in the back; she has no earthly idea how sisters are supposed to behave around one another, or how a mother and daughter are actually supposed to talk to one another in normal, every day situations. She's a mess, with her heart and head all tangled up in knots that may never come undone -- and that's even before the nightmares start.

Flurry Heart, however, isn't about to give up on her, and with a little bit of help from a lot of different ponies, she'll work hard to show Skyla that a family isn't about the blood that you share, but about the bonds that you forge.