Li Qian and Senior Brother Xiao He left the Luoyuan Taoist School and arrived at the Liwei Immortal City via the Transmission Array.
The Secret Realm that the Senior Brother wanted to enter was located here.
The entrance to the Secret Realm is immovable.
Therefore, Arrays are often set up, and disciples are stationed there.
Moreover, Secret Realms have the characteristic of clustering; discovering one Secret Realm in a location often allows one to find a group of Secret Realms.
It is precisely because of this that clustered Secret Realms are easier to manage.
Otherwise, with one in the east and one in the west... the management cost would skyrocket.
Xingjiang Secret Realm.
This is the name of the Secret Realm they're entering.
It's said that within the Secret Realm, there is a species of spiritual beasts called Xingjiang Generals... they resemble gorillas but are born with a thick armor, with amazing defensive power, hence the name.