As the Lords of the Three Thousand Immortal Cities, they all understood that the strength of the Evil God Clan had always been greater than that of the Human Clan. However, the reason the Three Thousand Immortal Cities and the Thirteen Holy Lands were allowed to exist was due to their fear of the Human Clan's power.
After all, if they truly pushed the Human Clan to the brink of extinction, the Evil God Clan would not fare well either.
Therefore.
The Three Thousand Immortal Cities and the Thirteen Holy Lands served as a buffer zone for the war between the two clans.
As long as the strength of the Mystic Sky Sacred Land was strong enough, it could make the Evil God Clan apprehensive.
Of course.
This "strong enough" did not refer to an ordinary Longevity Heavenly Venerate.
Gu Qingfeng was capable of killing four Masters of the Forbidden Area, a strength not weaker than the Qingmu Heavenly Venerate, and possibly even stronger.