Similar to what people in the Mortal World imagine, the Immortal Domain is indeed enveloped in ethereal mists, serene and tranquil, resembling an Immortal Mountain Blessed Land beyond this realm.
It's vast!
Beyond imagination in its expanse, the Immortal Domain is not just an ordinary Secret Realm but a genuine small heaven, closely connected to the human world.
However, at the same time, it is incompatible, not reliant on the Boundary Domain of the Mortal World. Hence, it is difficult to break open the heaven directly, and once the balance is disturbed, the small heaven becomes unstable.
It can only be accessed through the Immortal Sect.
This is also why Grand Ancestor Chu, understanding this, chose to directly seal the Immortal Sect, which is one of the main reasons those existing within the Immortal Domain allowed Chen Yuan to roam free for ten years.
After all, too many places are closely connected to the small heaven.
