Side Story: Fairy Dragon I
Before the guild war, Peridot has been meaning to find a way to evolve as she managed to read something about a special ancestor of the Ryujin. It was an existence that is said to be a Ryujin that came from the moon as they have the power of the moon.
The power of the moon does not necessarily mean that they are drawing power from the moon but have powers that constitute to the natural abilities of the moon. It is also known that the moon is connected to the Faekin as they are said to be descendants of the very first being that was created by the moon itself.
Since the Faekin and the moon are synonymous to one another in ancient times, the dragons that have the same power as the moon are called Fairy Dragons. Dragons that have the ability to alter nature itself with their own will just like how the moon influences the waves or the light during the night.