To go from the Realm of Gates to the Pathway of Immortality, one did not need to leave from the exit and enter the other side, as a certain black gate was already connected to the Pathway of Immortality. Thanos and Maskelyne suspected that the weird ghosts entered the Realm of Gates from this place, because they obviously carried the feature of the Pathway of Immortality.
After the monster intentionally changed the pattern of changes in the Realm of Gates, Lucien and Rhine saw a world of surging gray dust the moment they opened the black gate. There was a straight road leading to the depths of it.
