Perhaps because the Spirit Refining Art skill was a game reward, much like the One-Cubic-Meter Mobile Warehouse, Yan Ao did not need to train in it at all. He mastered it after just a slight practice.
"First, concentrate my mind... and then—"
Closing his eyes gently, Yan Ao channeled the power of the sigil according to the method in his mind. Within a brief moment, he began to feel a pulsation coming from his palm, and the source of that pulsation was none other than the Vajra Sigil.
Chapter 29