The Demonic Blood Reversal Technique, formerly known as Non-Right Blood Reversal Technique and later known as the Demon Art of Blood Reversion (역혈마공) or Blood Reversion Art in the novel, is a ki control technique that multiplies the user's internal energy by making the user stronger by reversing the blood flow in the acupoints[1].
It may have looked like a usable technique; however, it damages the user's blood and chi acupoints the more it is used, leading to the user's becoming insane. It was a dangerous martial art and was considered forbidden within the Heavenly Demon Divine Cult as it was banned[1].
It was created by the Heavenly Demon Patriarch when teaching it to Mok Yoochun, he intentionally taught it with some of the words or phrase reversed, and as a result, the Negative Martial Arts was created. It was not created intentionally, but was created through coincidence. The Heavenly Demon Patriarch is the only one who could use it without suffering side effects because of his Heavenly Body.
It would become a technique associated with and used by the Blade God Six Martial Clan as they perfected the debilitating effects of the technique and transformed it to the Divine Blood Reversal Substitution Art.