The Immortal Sect of Mount Tai is one of them.
The Space Gate is fixed in one place as if anchored, without changes in location.
But this type of Space Gate, its space barrier is extremely solid.
Unless one truly has the power to break through space, they can't even see this portal to space.
This is why the ten righteous sects must cooperate together; no single sect can activate the Immortal Portal on their own.
As for the other kind, the Space Gate is in a constantly drifting location, crossing various timelines.
This type of Space Gate does not have a guarding barrier.
Ordinary people might accidentally enter a different time-space by coincidence.
All kinds of myths about entering alternate time-spaces belong to this type.
In fact, most fixed Space Gates are artificially created, a spatial passage opened by a strong individual using Divine Skills.
The Immortal Portal that the Earth Immortal Realm refers to belongs to this situation.
