There once were cultivators who severed their path to immortality, seeking rapid progress by forcefully merging with infinite evil qi.
However, they were instead bewildered by the infinite evil qi, controlled by it, breaking away from the world to wander the Sea of Realms.
Such evil cultivators are called human demons and can even slay immortals!
There was such a description in the Mountain Ancestor's legacy.
But this description is very vague, not part of the original legacy of Buzhou Mountain, but added by later generations.
After ancient Buzhou Mountain collapsed, some cultivators still survived on certain remnants until later, when they encountered an unknown annihilating catastrophe and were completely destroyed.
The description was added by later cultivators, vaguely suggesting that the twisted creatures in the Sea of Realms are also related to human demons.
