Lin Zheyu speculated that Demon Skills like the Nine Revolutions True Demon Body, the Youjue Demon Canon, and the Seven Evils Ghost Canon were all founded through the study of demon tattoos on monstrous beings.
The Seven Evils Ghost Canon integrates the Corpse Refining Secret Skill of the Immortal Tao, using special demon tattoos to replace restrictions and arrays, tempering corpse bodies to cultivate a powerful defense of bronze skin and iron bones.
Meanwhile, the Nine Revolutions True Demon Body and Youjue Demon Canon are purer, incorporating less of the Immortal Tao Skill, appearing more as if they were created from scratch by researching demons.
After Lin Zheyu perfected his cultivation of them, he discovered the differences between the two.
Upon cultivating the Nine Revolutions True Demon Body to Fifth-Layer Perfection, special demon tattoos condensed within his flesh.
