"Void lineage?" Su Xin asked, puzzled.

"The void lineage refers to the endless dark void," Courtyard Master Bei Yun explained. "It is completely different from the divine body lineage you practice, the Heart Dao lineage, and even the Ten Emperors' Path that I practice."

"The divine body lineage and Heart Dao lineage are cultivation systems for practitioners."

"But the endless dark void is one of the most powerful sources of energy between heaven and earth."