With the existence of the Evil God Temple, he didn't need to put any time and effort into exhausting research. Furthermore, the Evil God Temple welcomed all types of origins. No matter what type of law, the Evil God Temple could accept them all!
On one side, there was the heinous demon who would plunge the world into chaos, while on the other side, there was his mission… Did he even need to think about it? What did world chaos have to do with Gu Nan?
The correct way to use resurrection was: people Gu Nan killed with the power of shadows or people who had the law of shadows successfully infused into them shortly after their deaths could be resurrected using Shadow Form.
However, he ultimately suppressed the impulse coming from the depths of his bloodline. Instead of turning back and engaging in a fierce battle with the enemy, he fled into the crack in the void, escaping to some unknown plane.