The ancestors of each family, some of them get bored staying in the Heavenly Cave and go out to the Outer Domain for adventures, seeking opportunities to advance further.
In such cases, if the passages are not sealed.
It becomes a tremendous hidden danger.
Once spiritual energy is sufficient and the environment is suitable, the opponent's Divine Martial Realm experts could continuously emerge.
Altogether, Four Immortals Sect, Three Buddha Sect, and Twelve Families, with nineteen passages, I can't patrol and guard them all day and night.
There's no time for sleep, and patrolling every day isn't feasible either.
Ignoring it is not an option.
Who knows when a master might emerge from the other side, hiding in the shadows, opposing our forces?
One hundred years of Spiritual Mechanism revival, and during these hundred years, must I play hide and seek with them, till exhaustion?
