Of course, the Yinluo Peach Blossom Miasma is a special type of magical artifact, and the amount of evil qi required to improve its quality is astronomical, beyond the capacity of an ordinary Foundation Establishment cultivator.
At Black Cliff Mountain, even Lady Yin Yu had only cultivated it to the level of an upper-grade spiritual artifact. As for higher levels, she likely could only imagine them for the time being.
However, in the Doomsday World, in the zombie flesh factory, separating the various parts of zombies releases a large amount of bloodstain evil qi.
Zheng Yi discovered long ago that if he observes with his Spirit Eye and sees through the heavens and the earth, he would find a layer of red clouds above the flesh factory that the naked eye can't see. This is the gas mass formed by the bloodstain evil qi.
