Among the Dragons Knights, one stands above all of them. One even the newest Knight will bow to.

Amber. The First Knight, and the first pony to bond with a dragon. Not bad for a Pegasus over a thousand years old, with no cutie mark, and a filly younger even than the CMC. And she plans to put the princess through the wringer.

Whether Twilight likes it or not.

Though this is technically the prequel for the entire series, this is not the first story in this universe you must read to understand most of it. The correct reading order is:

Crystal's
Twilght's
This story.
Celestial's