Domain Space - Part 2
Domain Space is an independent immovable space pocket made by exceptionally powerful cultivators.
Only those who had achieved a very realm in cultivation could form a Domain World with the use of some treasure that had a space attribute.
The book did not mention the name of the Treasure.
The cultivators would leave their will, their treasures, and inheritances for the descendants of their Clan or for the lucky person who is fated to have it.
The makers of the Domain space might be one cultivator or a big group or even an entire race of sentient humanoid beings.
The Sylvia Royal Clan must have had a very powerful cultivator as an ancestor who would have left a Domain space for them, or maybe they were just lucky to find a Domain space left by an unrelated cultivator.
Whatever it may be, Domain Spaces are excellent opportunities for a family or organization such as Sects to rise in strength.