The amount of auxiliary Spiritual Materials required was much less than that of the main ones.
With the Black Demon Stone he currently possessed, he had only enough to use it as the main material for a single Demon-slaying Sword with six Spirit Patterns. However, if used as an auxiliary Spiritual Material, it could support the refining of at least four Demon-slaying Swords at the Upper Grade Spiritual Artifact level.
Of course, since the main Spiritual Materials for refining an Upper Grade Spiritual Artifact-level Demon-slaying Sword were much harder to come by, he would likely have a lot of Black Demon Stone left over down the line—so much that he would probably never use it all.
'I'll aim for Eight Spirit Patterns!'
Having set his goal, Fang Yun adjusted his condition to its absolute peak before beginning to refine the Upper Grade Spiritual Artifact-level Demon-slaying Sword.
