Dragon/Arch Dragon

Arch Dragons (上位龍族) are dragons that have inherited more of the factor of the original Elemental Dragon than their Lesser Dragon brethren. They are born when a large amount of "Dragon Factor" in areas with a similarly high amount of ambient magicules and possess a fierce power.

After living for hundreds of years and gaining wisdom close to that of a human's, it is possible for an Arch Dragon to evolve into a Dragon Lord.

Attribute Dragons
On occasion, Arch Dragons can evolve into an Element Dragon (属性竜) and gain elemental powers similar to their dragon lord brethren, Although these Element Dragons are not as strong as Dragon Lords, they're still quite formidable Special A rank monsters that needs a platoon of Holy Knights to defeat one of it.

A Sky Dragon is a rare mutation as a Subspecies Dragon (亜種竜) that failed to become a Wind Dragon. Subspecies Dragons are Arch Dragons that mutated or evolved outside their Element Dragon brethren and are said to be weaker than them with six Holy Knights required to match one of them on average.