C746 Black Gas Utilization

"How is it?" Seeing Wang Tianyu's perspiration that was like raindrops, Chen Yu asked with concern.

When I started to refine the true energy, the meridians in my body felt warm. However, when I refined the black energy in my body, I felt that this black energy was very hard, or in other words, I could feel that this black energy was continuously corroding my meridians. Moreover