Shira Blitz, a unicorn mare planning on serving a princess.

Twilight Sparkle, an Alicorn princess who has no guards in her castle.

When Princess Celestia creates a new program that helps Twilight pick out the perfect guards, things start to get a little interesting. The point of the program is to, not only help Twilight, but help the guards improve their skills and become the finest warriors in Equestria. Shira, who was originally planning to serve Celestia, gets transferred to this new program to first serve Twilight and to better enhance her prowess. However, will she still want to serve Celestia after making some new friends along the way? She'll face different challenges, go through countless obstacles, and prove she's got what it takes to be somepony extraordinary.

However, behind every extraordinary pony, is an even darker secret; and Shira hopes that nopony will ever find hers out.

Thanks to everyone out there for the great OC suggestions in the fic.
And Thanks to Feather Flyer for the awesome coverart of Shira