C689 Experiment

This was an ancient oath, using the heaven and earth as proof, and its own blood as a guide.

Yu Bo cut his left arm and scattered the blood in the air. He then engraved the oath into his body.

Cultivators generally could not swear an oath because the Heavenly Dao could detect it. The moment one broke the oath, they would be severely punished. Thus, many times, when something unfair happened