Thanks to Yara's earlier explanations, Su Zhou knew that Ghosts, too, were divided into different levels.
The most common Ghosts were the white shadows and black Dark Shadows Su Zhou used to be able to see. The white ones were soul fragments with little lingering obsession, their True Spirits long gone; they could only be considered secondary derivatives of Spiritual Qi. In an environment with a high concentration of Spiritual Qi, they would quickly decompose into pure Spiritual Qi. The black ones, on the other hand, were soul fragments filled with resentment, obsession, and malice. Although they too would decompose in high-concentration Spiritual Qi, they first possessed the ability to latch onto people and cause listlessness.
The next level up, Wandering Souls and Resentful Spirits, possessed a degree of intelligence, like the little girl Wandering Soul and the old soldier Wandering Soul that Su Zhou had seen before. They had their own thoughts and intellect.
