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// Backround explained. 
// Story: A pony moves to Ponyville. 
// by Questioner 
//------------------------------//

“My full name is Greyhoof Scrollseal. I am a unicorn, as you can see. And I’m not exactly from around here, and by that I mean I’m not from Equestria. You see, when the three tribes left and eventually founded Equestria, we were left behind. Not me personally, of course, but my ancestors. I prefer to keep the rest of this secret, I trust that you can keep secrets.”

“Yes, of course. Spike, please can you go out and get some groceries? It needs doing, and I think this needs to be a private conversation.” said Twilight. 

”Yeah sure Twilight!” Spike replied”

“Please continue,” requested Twilight, after Spike had left.

“My ancestors didn’t follow the other unicorns, as they were sure there was noway that they would survive, and they didn’t realise the other tribes had left as well. You see, they guarded a vault of magical secrets”.

“What kind of secrets?” Twilight asked, looking puzzled.

“Dangerous ones. Knowledge of spells and rituals that could allow any pony to cause untold havoc. Powerful spells allowing one to control many minds at once with ease, the summoning of deadly creatures from beyond this world and more. It was decided not to destroy them, as with the knowledge of spell comes the chance of a counter-spell, in case the spells are discovered by another. As well as ordinary knowledge, just in case.”

“Wow.” Twilight said, looking shocked. “I can see why you want to keep that secret. But where are the spells now? You don’t appear to be carrying a library. And how did your ancestors survive?” 

“My ancestors managed to use magic to allow crops to grow.” I replied. “It was very hard, and they never grew as well as they would if an earth pony had done it. And as for the vault, well, about three hundred years ago, my ancestors decided to scry to see if anypony had survived. After finding out that they had, they started work on moving the vault. It took over two hundred and fifty years to perfect the enchantments that would allow the vault to be accessed from anywhere. But only by us. It took a bit long to be sure that it was stable, and then the few of us that were left, including my parents, left for Equestria. I was born on the journey here. I grew up travelling around Equestria, my parents never were content in one place.”

“So where are your family now? I would have though they’d be with you.”

“Dead. Something to do with attempting to access the Vault to archive some new theories about counter-spells when a certain entity is changing the physical laws around does not mix. I only survived because I was a bit further away, bored.”

There was a knock on the door, and Pinkie Pie came in.

“Let me guess, the party is ready?” asked Twilight.

“Yup!” answered Pinkie. “And it’s gonna be a doozy!”

“Great.” I said. “I suppose I’d better come along.”