"On thousandth year, on longest day,
She will return to end her war,
The stars will aid in her escape
And darkness reign forevermore"
She knew the stories, everyone here knew them. But for Twilight Sparkle, it was not enough to just hear a legend, to have it told to you. Who was the first to record the Legend of the Two Sisters? They had built their entire Order around this story, their Order of Light, that worshipped the Sister of Light from the legend, but yet so much of it seemed like it was left to hearsay. Despite being born into it, Twilight had always been a skeptic.
But now that she was properly going through the Order's deepest library, reading through their records and accounts, she understood. She began to comprehend what this legend was, and the warning within it. A warning excluded from the tale they told, the warning of the Light Sister's evil counterpart. The Sister of Darkness.
Twilight almost felt silly. This was an old book, but it was hardly an official record, it was more of a storybook if anything else. But... the almost exaggerated tale told here, about the Dark Sister and a dream-eating monster that merged with her soul, about how she would use it to return in a thousand years... All of it seemed to be hinted at in proper Order documents. Other records had been covered up with black ink or erased altogether, but there was only ever one reason that kind of thing happened.
Secrets.
But yet, for some reason, this storybook lay untouched, and Twilight began to worry that something set in motion a thousand years ago was dangerously close to coming to fruition. She needed more information, but there was only one other place here in the Order's main temple that she could go. The Forbidden Archives, a place restricted to all but the highest ranking members of their Order...
She stopped herself there. Was she really considering breaking into a restricted area just for the sake of confirming a legend? Was it really that important? Maybe... Maybe it was. If the rumors were true... If they were true, they were all in danger, weren't they?
These thoughts could be dangerous if she aired them out.
"Twily, is that you? It's late, why are you still up?"
The voice of her brother made her pause in her reading. She didn't startle or jump, but her focus was very much broken. She stood near a shelf, totally engrossed in the page and what they could mean, and slowly looked over to see him watching her with concern. It was late, after all, the only light in this room was from a set of candles on a desk behind Twilight. She'd been obsessed with figuring all of this out as of late.
"I've just been caught up reading." Twilight replied. "Sorry, I'll finish up for the night."
Her brother nodded, but stuck around in the library until Twilight closed her book and put it back on the shelf it came from. At first, she felt like he was watching her with some kind of suspicion, but she reassured herself that he was just doing his job as chief guardian of this place. Indeed, when she turned to look at him again he only showed concern.
"Is something wrong, Twilight?" He asked. "You look stressed about something."
"It's... can..." Twilight started. "Can this stay between us?"
"Of course," He nodded. If there was anyone she could trust, it would be her older brother.
"You know the Legend of the Two Sisters?" Twilight said.
"...Yes. What's this about?"
Twilight sighed. She might as well tell all.
“I’m worried about the Dark Sister’s return.”