Miasmic cultivator

Qi is everywhere. That is a fact. It is the origin and creation of many miracles. It gave humans the ability to defy the heavens and caused islands to float in the sky. It is what got the heavenly emporer where he is today. But what about its exact opposite? For everything that exists there is something that is it's opposite to exist with it. What could be strong and powerful enough to contend with that which gives humans peace of mind and clarity as well as giving man the ability to realize the very workings of the universe by connecting the mind, body, and soul?

Miasma. It is a vile darkness that all cultivators shed when they start on their path to cultivation. It is what all living beings are born with and what cultivators believe to be the impurities that holds them back from greatness. But what if individuals arose that cultivated in this vileness? What mark would they leave on this plane of existence?