The Demon Saint had taken a fancy to the Tinder Sutra!
To be honest, although the intelligence of demons was no different from that of humans after their level was higher, and they were even more cunning and sinister, they did not know how to do scientific research. They could not be innovative in their cultivation at all. If it were not for their own physical fitness, they would have dragged humans into the war before humans developed more cultivation methods. The demon world would have been occupied by humans long ago.
Even so, the world of man had once been glorious. They researched battle techniques and produced two Saints. They fought back and forth with the demons, but they still lost in the end.