Colossal Demon-blooded Dragon. If someone used this term while asking the most knowledgeable scholars in the art of dragon in this era, then he or she would not be getting an answer. Instead, he or she would be laughed at for talking nonsense.
Because the species represented by that term had never appeared in the vision of any human in the entire history.
On the Mycroft Continent, the dragons that were closest to humans were the common dragon species such as the Silver Dragon, Green Dragon, Copper Dragon, and other Metallic Astral Dragons. They did not mind living alongside the humans as they were willing to abide by the rules and laws of Order. In some countries, these colossal dragons were even the leaders of cities. There were even noblemen who had formal titles and territories, who were respected and worshiped by many people.