Soldiers of Harmony
by Ivy_Mist
First published
Twilight Sparkle goes to another dimension and finds out about a new magic and one of Celestia's former students.
During a trip to the Crystal Empire for an important meeting, her first as a princess, Twilight's crown gets stolen. She finds out about an old student of Celestia and discovers a world where she discovers a new type of magic that is nothing like the magic she finds in Equestria.