The idea first arose in An Jing's mind when he was trying to condense his various cultivation methods one by one.
The Seventh Tier Taibai Divine Insight, the Seven Killings True Method, the Heavenly Human True Explanation... All of An Jing's foundational cultivation methods successfully condensed into Divine Will.
Taibai transformed matter into something powerful and sharp, unmatched in armor-piercing; Seven Killings made a weapon's attacks extremely corrosive, destructive, and irreversible, while also allowing attribute switching; and Heavenly Human could manipulate the flow of surrounding natural Spirit-Evil, restoring a certain amount of Spirit-Evil and stamina with each attack.
Chapter 812