For a supreme Demon Skill like the Nine Illusions Mirage Demon Scripture, once a Cultivator reaches Foundation Establishment, one of their three aspects—Essence, Qi, and Spiritual—will begin to transform into that of a Celestial Demon.
Wu Siming's Divine Soul had already transformed into a Demon Soul, which could leave its physical body and possess another, just like a Celestial Demon. To maintain his "Wu Siming" identity, he had stored his own body in a Beast Taming Bag while his soul possessed another.
However, his Divine Soul had not yet fully transformed into that of a Celestial Demon.
Yang Jing's Celestial Demon Blood Transformation Divine Light was driven purely by his Talent. Since he hadn't cultivated the corresponding Demon Skill, he couldn't unleash a flash of bloody light that would completely convert an enemy's Divine Soul, Essence Blood, and Magical Power into pure blood for him to absorb.
