((I had this idea for a while, but I decided to kick it into gear when I saw this story on the front page.))
[size=24]HELP ME OUT WITH THE STORY BY JOINING THE GROUP HERE![/size]
{Love is magic as in Cadance and the Crystal Heart=Love so Crystal Ponies=Love instead of friendship.}
Twinkling Glass lives in the Crystal Empire, more or less the castle, with her honored teacher, Princess Cadance. The young crystal pony finds out that her beloved leader will be ambushed on the day of the Crystal Heart celebration, in a little crystal pony town called Mirrorville. (Holy crap, if anybody has a better name, suggest it right away. Credit shall be posted below if somebody does have one I like. Do not suggest Crystalville. xD) When informing her teacher, Princess Cadance decides it's time to have a loyal ambassador to the rebellious town of Mirrorville, and she decides to send none other than Twinkling Glass. So, the young crystal pony puts it in her own hooves to save her teacher, and has to get some elite ponies to help her, in a town full of treacherous glass ponies around every turn.

The unicorn has to find them before it's too late.

(If anybody has already done this idea, so sorry, but I'm still going to write it.)
[Another thing– Anybody who does a cover art gets a cameo who stars as an antagonist in an episode. Yes, antagonist, unless if you'd like them to be a good guy, or a good guy/bad guy (like Babs Seed, I can't explain it.)]