As the Purple Unicorn Eagle explained, everyone's understanding of this mystic realm gradually improved.
First of all, under normal circumstances, Yunlu Heaven was indeed a bird, wing, wind, space... It was the place where the demons ascended.
Not to mention the demons who had lived in Yunlu Heaven, most bird-type demons would be forcibly summoned to Yunlu Heaven after reaching five-star.
Of course, Yunlu Heaven was very suitable for most bird-type demons to live in, be it in terms of its rules or its environment.
"Sob ~(All foreign ascenders will be given a piece of the sky and become a lord. They will enjoy all the resources within the sky…As for the bird demons that were originally born in Yunlu Heaven, they could choose to challenge a lord after reaching five-star. Once the challenge was successful, they could replace the other party and become the new lord. They would also have the right to dominate the previous lord.）"
