Xu Feng took one thousand mid-grade spirit stones from his storage ring and threw them into the spirit field containing the crimson spiritual grass.
A moment later, a flash of multicolored light washed over the field. The color of the soil deepened, turning pitch-black and glossy, while the spiritual energy radiating from it grew even more concentrated.
Xu Feng lowered his head, grabbed a handful of the soil to inspect it, and nodded with deep satisfaction. He muttered to himself, "Once upgraded to Tier 3, the quality of the spirit soil has indeed improved dramatically. Only a spirit field like this can provide enough spiritual energy for Tier 3 spiritual medicines to grow."
Chapter 590