The stone of the spotless floor broke, the glass of the crystal clear windows shattered and Celestia felt the pure arcane wrath tear at her mane, which was honestly a quite foreign feeling for her, seeing that its ethereal state wasn’t influenced by any force but magic itself.
Curiously the thought of her subjects describing it as ‘flowing in a non-existent breeze’ came to her in this very moment. Truth was that this ‘breeze’ was very much real, as it was the ever present flow of magic.

So it came as no surprise that her mane and Tail whipped in the display of power and wrath in front of her. In this very moment it became painfully clear that Sephiroth never learned how to control her power properly. The display was instilling both, hope and utter terror, in the heart of the alabaster alicorn.
Hope, because the woman’s power was too unfocused and therefore the two sisters may be able to stop her, but terror, because she was a massive force to be dealt with.
If they allowed this to go on for much longer there were sure to be casualties. And a very great deal of destruction. She knew that this creature was dangerous. It was the very reason she imprisoned her in the first place.

Anger burned in this turquoise eyes of her and she was visibly growing more and more impatient when the princess did not answer. She was about to yell at her impassive face again when, suddenly, the large golden doors to the throne room slammed open with enough force that they were embedded into the walls behind them.
There, in the now ruined doorway, stood an alicorn mare of royal blue with a mane which looked like someone took a piece of the night sky itself to shape it, her face contorted in righteous anger as she glared at Sephiroth.

“Demon! Stand down and cease thy battle or we will be forced to take action!”

Perplexed by this arrival, Sephiroth turned around to look at the, for a pony, imposing figure, raising an eyebrow in confusion and assuming her uncaring pose once again, relaxed and arms crossed in front of her chest.

“And who, pray tell, are you to think you can interfere in this personal matter?”

Unseen by the woman a fearful expression took hold of Celestia’s face, but it did not go unnoticed by the newcomer. She narrowed her eyes as she saw the long and curved sword in the other alicorn’s back. She took a booming step forward, putting enough force behind it to break the tattered floor even more.

“Release our sister this instant!”

This got Sephiroth’s other eyebrow to join its counterpart in the journey upwards.

“Sister?”

Irritated, Luna took another threatening step forward and even spread her wings for a more intimidating look.

“Art thou stupid, demon?! We are Luna, princess of the night, and co-ruler of Equestria at the side of our sister!”

Completely clueless now the woman in black turned her head so she could look at the mare on the throne quizzically.

“What became of Nightmare? Didn’t know you had another sister just waiting to take her place.”

An enraged outcry from the entrance of the room claimed her attention before her question could be answered and again she raised an eyebrow at the sight. This ‘Luna’ had launched herself with a powerful thrust and obviously used both, her magic and her wings, to accelerate even more. Why, she looked just like she wanted to rip the woman’s head off, but instead of defending herself or attempting to counter the attack she just sidestepped it, looking bored and unimpressed.
Luna, for her part, slowed to a stop in an instant as she slammed into what looked like an arcane circle out of radiant blue energy and bounded off of it with even more velocity than before.

Dodging the incoming pony projectile once again, Sephiroth proceeded to slam her fist right between the wings of the princess as she passed by. The lunar alicorn cried out in pain and collided with the floor, hard.
This finally broke Celestia’s silence as she croaked out.

“Luna!”

Impassive the tall bipedal figure turned towards the alabaster mare again.

“I’m really curious there, you know? Who is she?”

This time she got her answer but not from the one she asked. The blue alicorn had risen from her position, wings hanging limp at her sides - good she had hit the right spot - and coughed a few times before speaking.

“I am, and always was, the princess of the night. Nightmare Moon was just a dark chapter of my life, when I succumbed to my feelings of jealousy and anger.”

To the utter bafflement of Luna the woman on the dais next to her sister broke into roaring laughter. To stunned by this reaction she missed her chance to take action while the fiend was paralyzed by so much laughter that her frame shook violently.

“Oh - hohoho! That - ahahahaha - that’s just too rich!”

After Sephiroth calmed down enough to open her eyes again she had to wipe away tears of mirth before she addressed the, obviously, confused mare.

“That was a good one. Now wait there while the adults talk okay?”

Caught off guard by the look on the princess’ face she actually took a step back. More out of surprise than fear.

“Wait… you’re serious?!”

At once Sephiroth’s anger was back with a vengeance as she spun around to face Celestia.

“Are you for real?! Making him betray me was not enough for you?! You brainwashed your own fucking sister and turned her into this-”

She couldn’t find the right word and gestured to the completely floored Luna.

“-this shadow of her own self?! Nightmare was my friend! And she could actually hold her ground against me! I didn’t even break a sweat for this!”

Affronted Celestia proceeded to yell right back at her with a fierce look in her eyes.

“And what should I have done?! She went insane after what happened to you! She tore down our old home and nearly killed me in her rage! Her name became the very embodiment of bad dreams and the greatest fears of ponykind due to her actions that night! All I wanted was for her to have a fresh start and not face the wrath and fear of my little ponies!”

Desperately she tried to rectify her actions, to make an excuse, to make Luna see that it wasn’t her fault. Pathetic.

“I never meant for her to change in this way but I misjudged the elements and their effect upon her! So I made up that Nightmare was nothing more than a being that possessed her!”

Her voice then became laden with guilt and regret as she searched her sister’s gaze.

“I never thought the very artifacts she once controlled would do this to her. All I thought they would do was to strip her of her power temporarily so I could sort out our dispute.”

Absolute silence followed her outburst, with every being in the room having a different reason for it. Celestia stared, eyes wide in shock about what she just revealed, ears splayed back because she feared for the worst. Luna stared too, but at her sister. Denial and disbelief on her face, which was a slightly lighter shade of blue now due to her blood draining out of it - the pony version of paling.
Sephiroth just stood there and let her gaze lay on the form of the pony she once thought of as a competent ruler.

And then a cruel thought entered her mind.

Waiting for the unavoidable she switched her sight to the, undoubtedly broken, princess of the night. And just like she expected there were tears slowly beginning to leak out of her eyes. She worked her mouth soundlessly a few times before she uttered in a near whisper, but somehow with so much weight and despair behind it that even Sephiroth flinched, albeit barely noticeably, even more so considering the situation.

“This can’t be right… sister please… tell us that this isn’t true… please…”

Celestia wasn’t able to do anything but avert her eyes in shame. This was all it took to ultimately break the smaller alicorn. She turned and fled the room, tears trailing in her wake.
That was the moment the woman had waited for. Slowly she faced the remaining princess once again, with a look of disgust and condescension, she spoke calmly.

“You are not even worth it, princess.”

With that she jumped on the top of the throne’s backrest like she had just hopped on a small step, pulling out her sword in the process and eliciting a yelp from the mare. She swung it once to clear it from any traces of blood, which formed a near perfect half circle on the ground, and then ‘sheathed’ it at her side. Seeing that there never existed an actual sheath for her sword she just did the motion and held it by her side. She never really knew why she did that, but it had a taunting aspect to it, so she liked to think.
She glided over the princess’ head and calmly walked away, never once looking back, but grinning to herself when she heard the intended breakdown behind her.

She would find him herself. This was just a way too good opportunity of effectively destroying both princesses at once without even raising a single finger in doing so. Somehow it seemed to fit perfectly.
And maybe she even helped Nightmare in claiming her true self again. There never was a ‘Luna’, after all.

When she exited the castle, nopony daring to stand even in the proximity of her path, she allowed herself a dark chuckle. That was when it hit her, quite literally.
A slab of paper hit her right in the face.
Stock still, she stood, but the offending thing refused to leave. It seemed to stick to her by some unexplainable force, so she ripped it away, completely intending to just throw it away. But in the motion she caught a glimpse of the front of it and froze.

It was a photograph. In and of itself that was not an unusual sight in Equestria. But what it showed was what gave Sephiroth pause. A human.

“What the…?”

Just then she could hear a voice speaking out of nowhere.

“Time, the real final frontier. This is the token of Max Caulfield, the Master of Time. Its mission: to seek out those who would protect others and tear down tyranny; to boldly go before me so that I may be called when the time is right.”

Staring unblinking at the picture she did not know what to say, other than to complete her own sentence.

“...fuck?”

Out of all things that should be going through her mind at this moment, the only thought that came to her was. ‘Why would it find me? I certainly will not protect others!’
Anger boiled in her veins and she crushed the paper in her fist, her face contorting in rage as she yelled at it as if somebody could actually hear her.

“You dare slapping random pictures into faces of others! Just come over here and I will teach you not to cross me!”