That is essentially innate.
It is a kind of talent, a qualification called the "Gray Mist Walker."
Only they can still walk freely among the All Heavens and Myriads of Realms when they are weak.
"Old Demon Chen can be considered the first Profound Immortal to join the Demon Cultivators. We even suspect that he was already a Demon Cultivator before the great changes in heaven and earth," Cultivator Shen Yu interjected, explaining to the others, "The entire family's style, to put it simply, is arrogant and domineering. They disregard the weak and even other Cultivators outside their own family, naturally adapting to the cultivation methods of Demon Cultivators."
But even so, their betrayal still brought great losses to the Orthodoxy.
In fact, dozens of great worlds were completely destroyed in that first rebellious battle, and hundreds of billions of Cultivators became fodder and blood sacrifices for the Demon Cultivators.
