After learning that Aperture Keys were the apertures of Yin Cultivators, Chen Miao could only say that Yin Cultivation certainly lived up to the "yin" in its name.
As for why Grandmaster Yin Cultivators condensed their own apertures into Aperture Keys, no coercion or theft was involved. Unless they were willing, no one could force another person to condense an Aperture Key, no matter what they tried.
Most Crossing Gates circulating in the real world came from powerful Grandmaster Yin Cultivators who, after dying eight times while entering the Mortal World, refused to risk a ninth attempt. Before their deaths, they poured their lifetime of cultivation into the corresponding aperture and condensed an Aperture Key to pass down.
This was also why many great families and sects focused their cultivation on a single aperture.
Aside from their Mystic Arts requiring that aperture, the other reason was the Aperture Key!
Otherwise, if they opened a different aperture and reached the aperture nourishment stage, only to find themselves unable to open their inherited Crossing Gate, they would effectively lose their chance to explore the Mortal World. That was hardly good for the continuation of their legacy.
Once a Grandmaster Yin Cultivator condensed an Aperture Key and lost all their cultivation, their life also reached its end.
They generally died within seven days.
Those Grandmaster Yin Cultivators accepted this opportunity to arrange their own affairs while still lucid.
As someone in the funeral industry, Chen Miao understood. After all, quite a few of the clients accepted by Tianmen Funeral Home chose to end their own lives rather than burden their descendants or prolong their suffering. Even ordinary people did this, and Yin Cultivators who had reached such heights naturally had their own pride. They were even less willing to see the indignities of