The Eight Notes of Heavenly Dragon that he had learned back then allowed him to subdue any beast possessing the Dragon's Bloodline as long as it had not reached the purity of a Pureblooded Dragon.
At the start, he had been a little apprehensive at using the Eight Notes of Heavenly Dragon as he thought that it would not be too effective against a Saint 8-dan beast. On top of that, it also expended a great deal of his zhenqi, which would only result in his weakening. Yet, contrary to his expectations, it worked much better than he predicted!
If only he had known that it would be like that, he would have just done so right from the start and spared himself some pain.
"You are… a Pureblooded Dragon?"
While Zhang Xuan was still in thought, the convulsing Netherworld Azure Dragon Beast stared at him with deep terror reflected in its eyes.