"Later, when the Immortal Path reopened, these Heavenly Demons once again gathered here, and there were no more evil spirits appearing in the Mortal World, effectively making this place a venting outlet for the Heavenly Demons entering the Mortal World, and thus, it cannot be blocked."
The young cultivator immediately understood upon hearing this; when the barrier between the Immortal Realm and the Mortal World weakened, Heavenly Demons could also descend to the Lower Realm from there. However, due to the opening of the Guiding Immortal Road here, it allowed them to primarily enter from this location, and with us guarding here, it ensures more effective protection of the Mortal World from being affected.
