Most mysterious of all was that the black mist carried an immensely powerful corrosive effect.
Ordinary Qi Refinement cultivators or Foundation Establishment demon beasts died the instant they touched it.
Golden Core Demon Beasts could barely endure for a while, but at most, they could only hold on for around ten breaths.
By then, they would all melt into pools of blood.
The tens of millions of demon beasts outside Golden Winged Mountain were terrified at the sight and scattered in every direction, yet it was utterly useless.
After all, the massive black mist had already enveloped an area spanning tens of thousands of miles, and it was indestructible.
Although the Nascent Soul Middle Stage demon lord and the two Nascent Soul Late Stage demon lords in the sky intended to help, Yan Siyi and the others had them tied down, leaving them unable to break free.
What was also worth mentioning was that, under Ghost Immortal Lamp's deliberate control, the black mist did not provoke those Nascent Soul Demon Lords.
Thus, those tens of millions of low-level demon beasts became like sheep trapped in a cage, able only to wait for the black mist to devour them.
Yet strangely enough, the remnant souls of the demon beasts corroded into bloody water by the black mist did not fade away with time. Instead, after coming into contact with the black mist, they underwent mutations one after another. Like maddened fiends, they devoured every last drop of the bloody water formed from their own flesh.
In the end, they all became bizarre crimson wraiths. Their strength was far from ordinary, and they were by no means comparable to the souls of typical demon beasts. At the very least, they retained roughly sixty to seventy percent of the strength they had possessed