"No luck on finding anything about that darn chest yet, sis?" Sunset asked.

"Nope. I've been over every book here in the library. With some help from Flash Sentry." Twilight said.

"And yet nothing in any book mentions anything about a chest being hidden by the Tree of Harmony." Flash said. "Though it did give me an excuse to find some interesting books to read." He added.

"Heh...Yeah you and my surrogate little sister are going to get along just fine." Sunset admitted with a smirk.

"SUNSET!" Twilight yelled.

"I thought older siblings; surrogate or not; were supposed to protect their younger siblings?" Flash asked.

"Hey, you practically chased Twilight here. That takes guts. As far as I'm concerned, Twilight's lucky to have you." Sunset said. "I'm not jealous about it. Well...okay maybe I am a little. But at least I'm not about to go something akin to Nightmare Moon because of it." She added.

"Nightmare Moon?" Flash asked in confusion as he tilted his head.

"Something that we went through before we chased after Sunburst." Twilight said. "And before I became a princess." She added, flexing her wings.

"If you ask me, the only thing that's changed about you right now sis, is the fact that you have to constantly remind the townsfolk to not address you as royalty because they know you from before." Sunset said.

"That's only because it's true." Twilight said. "The ponies in this town do know me from before I became an alicorn princess." She added.

"Hey, if you ask me, you just seem to fit the role. Even in the human world, you had that attutide that if you ask me, gives you the right kind of mindset to make you a perfect candidate to have become Princess." Flash Sentry said. Twilight blushed from the compliment.

"Wow Twilight; you sure know how to pick your coltfriends. He's not just smart, he's quite the smooth talker." Sunset said. "But enough about that, I'm going to have Spike send a letter to Princess Celestia." Sunset said.

"Eh?" Flash Sentry tilted his head in confusion.

"Why do that?" Twilight asked.

"I'm asking her if she thinks something from the canterlot archives would be able to answer our problem." Sunset said. Suddenly Spike came in with Sweetie Belle.

"Oh hey you three. Me and Sweetie Belle wanted to hang out here in the Library for the day." Spike said.

"Spike, can you send this to Princess Celestia please?" Sunset asked, showing the letter.

"Sure thing Sunset." Spike said and sent off the letter.

"...How does that work? Oh wait. Magic. Almost forgot: Different world, different rules." Flash Sentry said.

"Easy mistake." Twilight said, before leaning her head onto Flash Sentry.

"Wow, not even subtle are you?" Sweetie Belle asked.

"Your one to talk Sweetie; you sometimes do the same to me." Spike said before he burped up a letter.

"That must be the response." Flash said.

"Dear Sunset Shimmer, while the Canterlot Achieves indeed have many documents, I believe you might have better luck in the old castle located in the Everfree Forest. It contains books from one thousand years ago. I would suggest starting with the books there instead." Sunset read off.

"That place again? I think my sister went to grab Fluttershy for someone to bring with her to restore a few things from that place." Sweetie Belle said.

"Well, then let's not waste any time. Spike, you and Sweetie Belle can stay here." Twilight said.

"I will. I promised Rarity I'd protect Sweetie Belle no matter what." Spike said.

"Your growing up Spike~" Sunset said.

Later, the elements plus Flash were reunited in the room where Twilight found the journal of the two sisters.

"Pony of Shadows sounds like something from a fairy tale." Flash Sentry said.

"Well, some things are based in some kind of fact." Twilgiht noted. Suddenly a female cry pierced the area.

"Wh-what's that about?" Rainbow Dash noted.

"Well don't look at me. It's not me this time." Pinkie Pie noted.

"Well if she's here, then whose making that racket?" Applejack asked, the crying getting louder.

"I think it's best if we checked it out." Twilight noted and headed off with her friends in tow. The group soon came across what looked to be a filly version of Nightmare Moon, only the cutie mark was different, and she had on a green jacket with some glasses laying next to her.

"Um...hello? Wh-who are you?" Twilight asked the filly. The filly looked at Twilight and went wide eyed before tackling the purple alicorn into a hug.

"Mommy!" The apparent baby Nightmare moon said.

"Mommy?!" Pratically everyone else said.

"Well as far as I can tell..." Princess Celestia said. "This filly seems to come back and read as an entity from a different version of Equestria." She added.

"Oh no..." The apparent baby nightmare moon said. "I got sent to an alternate equestria because of some stupid comic I was reading." She added.

"So, do you have some name do you go by besides Nightmare Moon?" Rainbow Dash asked. The filly nodded.

"Uh-huh; my momma named me Nyx." The filly answered.

"Nyx...yeah that sounds like something Twilight would name something like you." Sunset said. The filly looked at Sunset strangely. "...Why are you looking at me like that?" She asked.

"Sunset Shimmer?" Nyx asked.

"That's me kiddo." Sunset said.

"Why are you here in equestria? In my version, you were tasked by momma to learn friendship in the human world." Nyx said.

"You've been to the human world in your version of Equestria?" Twilight asked.

"Uh-huh. My Princess Celestia said it was fine for me to go with momma because there would be no way for us to encounter my counterpart." Nyx said.

"So, I only have a question then: How did you help your Twilight out with Chrysalis?" Sunset asked.

"I simply made a scene to get momma away from meanie Chrysalis while she was disguised as Cadence. A very believable scene too. My Princess Celestia even bought it. Not to mention my Applejack too." Nyx said.

"What exactly did you do?" Applejack asked.

"Made it look like something was trying to control me by firing off random magic blasts." Nyx said. "Considering I was created using the essence of Nightmare Moon and some of my Twilight's Blood, it was an easy sell." She added.

"So wait, you are a magically created being?" Twilight asked.

"Uh-huh. Though it looks like you and your Pony Flash Sentry are getting together." Nyx said.

"Shining Armor checked once I came over. There's no counterpart to me." Flash Sentry said. "I'm from the human world." He added. Nyx went wide eyed.

"First Sunset now him? I'm going to need to know everything from beginning to end." Nyx said.

"Sure just...take a seat for a while." Spike said.

"So wait, what about me and my fellow crusaders?" Sweetie Belle asked.

"Oh you girls? You're my best friends. And even after I got my cutie mark, you girls still let me be a crusader and help out." Nyx admitted.

"I guess we would do that huh? Especially if you didn't have one when we first met you." Sweetie Belle said.

"Twist is one too. Though an additional reason is because my Diamond Tiara still bullied her." Nyx said.

"You tell us your history, we'll tell you ours. Sound good kiddo?" Sunset asked.

"Sure Miss Sunset." Nyx said.

"...Going to have to get used to something similar to that I can already tell..." Sunset said.

Author's Note

Raise your hand if you expected me to do THIS of all things in this universe. This might more than make up for the fact that I didn't change much otherwise with this episode.

Nyx is a character created by Pen Stroke - Fimfiction in their story Past Sins - Fimfiction.