A 16 year-old boy is transported to Equestria and given the form of a dragon. He makes several unexpected friends and at the same time will discover his own powers, but will the ponies trust him because of it? He will have to convince them if he is to stop the upcoming threat and restore balance to the magic of Equestria.

"Ever been called a hero? Ever been called the best of the best? I've been called both of these many times before, and it never ceases to amaze and terrify me. For if I am the best, shouldn't I be able to conquer all obstacles in my path? Shouldn't I be the one to solve problems no one else can? Shouldn't my enemies be dead, my friends happy, and my alliances unbroken? Shouldn't my life be... perfect?"

                           - From the Diary of a Changeling

It is a common perspective among most species that changelings are, for the most part, fairly weak creatures. They don't have the strength of a diamond dog. They don't have the speed of a vampire. Only a few have even a hope of challenging the knowledge of a dragon. Numbers, disguises, and their Queen is what most hives rely on. This is true of course, and Chrysalis knows it. Changelings are a fragile race, and if one day their unity would fail, a fail-safe must be ready. A fail-safe that, alone, could stand against any threat. Any situation. Any obstacle. A hero, which all could look to when times were dark.

That had been a long time ago.