Styx's POV:
Having returned home from the small war I decide that it is time for Starswirl to learn not to mess with a Changeling. Thanks to Twilight I know where Starswirl lives, and I know that he is working on a new spell that can change Equestria forever. This spell entails putting multiple pieces of multiple spells together to create a new spell. One stemming from the Elements of Harmony. I don’t know its exact purpose, but I have a feeling it will not be good for me. His house is in the Western Mountain Range and is hidden under a dense forest of trees. I leave Sombra in charge of the girls for the day and begin my train ride/flight to his home. I take the train all the way to Las Pegasus and begin my flight west from there. As soon as the forest comes into view I dive down under the canopy of trees and begin my search for his house. For being an all powerful unicorn, he doesn't hide things well. In fact, it is in the middle of a large clearing with no tree cover around it, except for the large trees that make up the canopy over it. I use my magic to detect if he is home, he isn't, which means my task will be easy.
I enter his home and immediately come upon something that looks similar to the Ponyville library. The only difference being that there are a lot more notes scattered and his bed is in an entirely different room. However, I don't see his journal, so I must go looking for it. I start by cleaning up all of the notes and putting them into a nice stack on the desk. And lo and behold his journal is under all of the paper on his desk. I pick up his journal in my magic and open it to the last entry.
Spell
I write this as a reminder as to how much of the spell I know.
As all turns around
Evil has come back
Good is still reigning
Banish those who hide
Protect from the darkness
Turn the tide of war around
Make unicorns, pegasi, and Earth ponies
All under one mind
Protect from those who change
To those who want to see reverse
From those who once ruled
Save the Crystal Empire from ruin
Reminder of those lost
?
?
?
I can't believe how close he is. Three lines away from Sombra and I's destruction. I rip the page out, teleport that page home, and set the journal next to the pile of notes. I light the notes on fire and continue to leaf through the journal. Finding all of his notes that he took on me when I was imprisoned.
Styx
Still alive
Dark Changeling magic
Possible invisibility spell
Capable of light unicorn magic
Pegasus flight
Earth pony strength
Uses tracking spells
Immortal life unless starved
Can outlive Alicorns?
I start to realize that it is a good thing I am burning this, he knows too much, and he is relentless in making sure I can't be around in Equestria. I flip to another page.
Sombra
Alive
Pulled from Limbo by Styx
Mortal enemy
Dark unicorn
Knows the dealings of Limbo
Accepted by society
As I watch the last flames sputter out on the notes and set the journal down. I light the journal on fire and find a piece of parchment and quill to begin writing him a note and a warning:
Starswirl,
Should you wish to know what was on the pages that are now ashes, come find me. I'll be more than happy to tell you, for a sickening price.
Yours truly,
Styx
I sign the letter, laying it down in front of the ashes. Knowing that one day, he might come looking for me. I teleport home, knowing that a summons from Celestia is waiting for me, calling me to her, and what my life holds after this. But at least after this I will be able to change whenever I feel like, and no one can stop me, not even Starswirl.