The chapter opens with a description of the various types of spiritual stones that are used by the students at the skysoul academy. The first stone is called the "step significant material for cultivation," and the second stone is the "ancient bloodline," which is rare and difficult to find. The third stone is "the ordinary blood line," which means that the scarlet demon must have the "ordinary blood line" as well. The chapter ends with an explanation of how these stones can be used to cultivate the soul. Heavenly energy is thin in the ruins realm, so a demon spirit can't cost too much to cultivate. On the other hand, these stones contain "pure heavenly energy" , which means they are very useful for medicinal pills.