The abode of the Supreme Female Demon, is the most elegant structure on the Earth Flame Pillar.
The Bloodline Demon's predecessor was the Sheep-headed Monster civilization, whose civilization level was not considered high before the Bloodline's invasion, even still in the stage of a barbaric civilization.
Therefore, the Sheep-headed Monster civilization did not develop a very prosperous culture.
Perhaps the civilization tree was tilted, as early on in the Sheep-headed Monster civilization, they specialized in reproduction and physicality, so despite their civilization level being low, they developed a massive population size.
This is quite different from humans.
Though humans also have a large population, they have invested a lot of skill points into learning abilities, thus advancing towards a technological civilization.
Without developing advanced technology, the sheep-headed monsters can survive in various harsh environments.