Atmospheric Head-canon illustration around my AU [Alternate Universe] with an additional story including 'Twilight Sparkle' and Everlight Everlasting! *
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Brand new edition to my head-canon universe is now up! Took a LONG while, but I'm super proud how this came out! I literally couldn't wait a moment longer to share! I had so much fun! <3
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HEADCANON

A head-canon or alternate universe, if you wish; a time long after Princess Twilight has been crowned the ruler of Equestria when Princess Celestia and Luna had retired, Twilight was now responsible along with her best friends to take care of the land.
Yet as time when on and her appearance never changed compared to everyone else, is it possibly that other then being a Princess and an Alicorn; maybe she was more different then she thought. Immortality made her stand out among any-pony else. And with immortality, comes great happiness and great grieve...

Twilight Sparkle, after a peaceful yet grieve filled 222 years on the throne; the trauma, pain, grief, and anger that built itself from her family and friends passing away around her manifested itself into an altered being of a darker, deeper attire.

Everlight Everlasting.

Princess Everlight is the figuration of all of Twilight's grief and desires, and the one that'll assist Twilight in gaining what she wished most to rid herself of any more grief. Immorality. Twilight/Everlight could not gain a spell or enchantment of pure immortality after decades of previous research and personal experience, so the best solution was reversing the decrease alteration of age itself. Her goal become set in motion to discover the greatest volumes of research and experiments in all of pony kind.

If she were to create such a powerful, conflicted spell that does not exist yet, she needed some help. And help could only be found in the most knowledgeable places in Equestria and the assistance of a particular wizard...

STORY

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MORAL IMMORALITY

"Why in feather-blazing, multiple coloured TARTARUS is that book??"

Everlight Everlasting hissed quietly underneath her cold, annoyed breath. Her star pupil irises gave off a soft pinkish glow in the low, evening moon lighting that crescent-ed itself into the famed room that once belonged to Princess Celestia and Luna.

The Castle of the Two Sisters once a ruined pile of rumble multiple centuries ago was refortified to its previous state before the battle between Nightmare Moon and Celestia over a one thousand years ago. Yet everything, including the ancient books were present thanks to Princess Twilight's duration.

Everlight was looking for a particular book. She had been exploring, searching, and grinding every bookshelf, available secret rooms, and studies on the 'Fractions of Observing Time'. She has researched in her available days and nights on the dictionary of all the book titles in the castle. Overall, she has her own study on this new age reversing spell she was practicing yet it was not ever ENOUGH.

Experiments came and went with her spell, each time improving a little more as the spell lasted a little longer, but it was NEVER ENOUGH. The spell automatically reverses the user's age back to its original state after sometime, but Everlight wanted it to be permanent. She wanted it to work as if she reversed a pony's body age so that they may live a longer, happier life.

Thankfully, she has not experienced the spell of ponies yet because 'Why would I ever do that?' Twilight exclaimed. Practicing on a dying flower, a wilting tree, and at one point a passing butterfly.

The flower turned into a seedling. The tree turned into a sapling. The butterfly turned into a caterpillar. She was ecstatic!

Yet to her mass disappointment and deeper sadness, the spell only lasted for a complete day at most. She could not even save a pretty, little butterfly...

"Okay...Okay Twilight, just...Stop and think for a moment. Breath in. Inhale Breath out...Exhale You just need to think clearly. Yes, that is what it is. Of course, the book is still here, I have checked seven times at the book catalogue of this place. It is here, I just need to remember where it is...M-Maybe it was just put in a different place or behind a wall or m-maybe it could just be GONE FOREVER AND I CAN'T-"

Everlight suddenly had to stop in her steps as she pressed her front hooves against the sides of her widened face, she was beginning to hyperventilate again. 'CALM DOWN, CALM DOWN TWILIGHT. REMEMBER WHAT CADENCE TAUGHT YOU. Remember your exercises, remember your breathing technique.' Everlight thought, carefully sitting down and bring her hove out slowly with a controlled inhale before bringing her arm back in with a firm exhale. Breath in. Breath out. Breath in...

BREATH IN! Breath out.

After a shortened minute of panic reducing exercises, it allowed Everlight another minute to think. Even if another minute spent sitting around means another minute lost for another friend of hers. She just needed to concentrate...

"'The Fractions of Observing Time'. The book could be placed within the mathematics section of the library, yet that will probably be too unusual to organise in that section. With such a book, it will go perfectly with the document on 'Immature Lifespans', the scroll 'Reversing Measurements of Decay', and the age spells Starswirl professionalized...What a moment...Such a book would not be a casual read, it will likely be in the sister's own studies! Luna did talk to me about her research about how time worked. Her prolonged time on the moon made her really patient with the complex subject."

The Alicorn stated with growing confidence, she no longer walked but trotted to her new destination with a quiet flap of her gradient wings. Castles were always a little chilly this time of year, which is why her breath came out like a carbonated fog that drifted behind her, Everlight honestly could not wait another minute as her silver trimmed shoes clip, clapped against the stone flooring and royal carpet.

"Luna also said that time was different in space compared to Equestia...Perhaps I should do a little, light reading on that, I have always been curious of the stars."

Everlight chatted to herself, relaxing her excited and tense chest with the sensory that passed her as she entered Celestia and Luna's ancient study. Only for a moment as she entered did she stop, she swears on her throne that she heard a group of familiar pony's laughter and flashes of nostalgic smiles in her senses staring at the darkened, dusty room. Unconsciously, her hove shook away an escaping tear that saved the flood gates behind her eyes from breaching.

No crying now. She needed to search. And search seriously now, there must not be another failure today. There is only a limited amount of time to...

There it is! On a shelf she just could not reach on her hind legs, as delicately as her wings would allow, she bounced up and grabbed the ragged book that's spine expressed the name of its contents. 'The Fractions of Observing Time'. Even after centuries, a millennium, the book's bindings shivered in painted gold patterns that decorated its droopy, bleached blue covering. Unknowing to other ponies, the language on the covering and spine was of ancient pony English but Twilight Sparkle could recognize the symbols and their meaning. Twilight did have mass amounts of free time over the years...

Studying ancient languages was part of main goal she was working towards, though admittedly when opening the yellowing pages, her knowledge of ancient pony English will become refined in time, but she could not help but give an excited grin.

"OH TWILIGHT. This is just what I needed...This is it...It is only a matter of time my friends, you'll finally be okay..."

She exclaimed, escalating her excitement further as she professionally put it on the display in the centre of the room to observe. The glow of the golden paint glittered in the low lighting, yet now as much as her shaded eyes. Her mouth curled into a tense chuckle as her neon pink magic turned to the context pages. This is the beginning of something BIG.

"Only a matter of time now...Only a matter of time...I'll save you, and my friends, I'll save my subjects no matter what...Only a matter of moments now...I PROMISE, I'LL MAKE THINGS RIGHT AGAIN..."