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The so-called false Hollow Void refers to the fact that a person in the Human Realm can wield the power of the Hollow Void Realm due to the blessing of the Will of Heavenly Dao; however, once they leave the Human Realm, they will be reduced to their original state.
As for why it is certain that Yu Xian is not of the Hollow Void Realm.
It is because when a cultivator breaks through to the Hollow Void, the birth of the Void Realm must resonate with this world, and he, merged into the Human Realm's Void, would surely sense it.
Even in the Spirit Realm, once a cultivator of the Hollow Void Realm makes a breakthrough, there must be celestial phenomena and universal celebration.
This too is a rule.
Therefore, he could be certain that no cultivator of the Hollow Void Realm had yet appeared in this world.
Self-preservation is the instinct of all living beings.
Although the Will of Heavenly Dao is chaotic and acts based on Dao Rules, it too strives for survival.