So, here I sit, in the middle of Celestia knows where...Hmm...I wonder...am I...inside the Heart? I suppose it doesn't matter anyway. Honestly, how do I get myself into these things.......
I pace the floor of my room in the Canterlot Apartments, unable to sleep. My silver coat was rough and my black mane a bit unkempt, as I had not groomed myself in quite some time. My mind raced Can it really be true? Can such things even be contained in a book? I had heard rumors of a tome contained in the Canterlot Archives that detailed spells capable of changing the very nature of the world around oneself. Such magic had only been thought capable by Celestia herself, and certainly not something that could be learned by a mere book. Yet, the possibility is captivating...No! I can't allow myself to think like that. Such power would surely corrupt anypony who wielded it beyond repair.
Still unable to sleep, I decide to take a walk outside for a bit. As I step outside I almost have to shield my eyes. Such is the drawback if being so near to the border of Canterlot and the Crystal Empire. Amazing how that place shines so bright, even with a mere half moon out tonight. As I walk along the light in the corner of my eye draws my attention time and time again. I decide to head over to the gleaming city. As I walk out of the snow and onto the crystalline tiling the ground is covered with, I can't help but notice a black figure. I approach cautiously, and as I grow nearer, it notices me and quickly takes on the appearance of a pony-shaped gemstone, not unlike the inhabitants here. Was that... No it couldn't have been a changeling, you're simply imagining things! I continued down the path, and noticed another crystalline pony walking by. Still...it can't hurt to be sure. My horn starts glowing, casting a magical light upon the pony, as its form was reved to be black, and riddled with holes. No. It...it can't be true. But the more I thought about it, the more it made sense. It would explain how they acquired their crystal form, and how they could so expertly manipulate the power of love and friendship. Driven by fear, I let a burst of energy fly forth from my horn, only to be deflected, and for that wretched channeling to let out a hiss, alerting others to me. They no longer bothered with their now useless disguises, instead focusing their power on something more worthwhile: Getting me out. Their collective magic was stronger than my own, and I was forced to flee, but they couldn't make me forget what I saw.
The Crystal Ponies...were changelings.