Chen Nianzhi had directed him to slay the Blood Demon Ancestor precisely so that he could follow in the footsteps of Daoist Cihang and cleanse the Purple Yin Realm's heavens and earth of this boundless foul qi.
To the heavens and earth, the foul qi of the Purple Yin Realm was a virulent poison. It coiled within the blood spring like stagnant blood within a human body.
Originally, this had been a minor matter. But after the Purple Yin Realm was exiled into the void, its injuries worsened by the day, and the stagnant blood accumulated in ever greater amounts.
The Demon Abyss Heavenscar of the Purple Yin Realm could never be healed. It was torn open once every thousand years, and the stagnant blood was one of the key reasons.
If the stagnant blood in the Eastern Wasteland Blood Spring was not drained away or transformed, this wound would remain like a maggot gnawing at the bone, impossible to cure completely.
Chen Nianzhi had sent him here today so that he could thoroughly heal the Eastern Wasteland Blood Spring and cleanse away all the turbid qi and foul qi within.
In principle, cultivators who practiced Pure Yang Dao arts all possessed the ability to cleanse foul qi.
But the East Sea Blood Spring was extraordinarily vicious, and it contained an inexhaustible power of the blood sea.
Low-level cultivators simply could not enter it. Even if high-level cultivators could cleanse a portion of it, compared to the vast blood sea, it was merely a cup of water against a cartload of firewood.
There were only two people in the Purple Yin Realm capable of undertaking this transformation: Chen Nianzhi and Jiang Linglong.
Both cultivated Primordial Chaos mana and could transform all manner of exotic arcane powers. If they spent tens