C1172 Bargaining

"Alright, I will wait here for you for a month. After a month, bring the refined Qianyuan Dan here to find me. No matter how much you refine, I will help you do one thing. " Venerable Black Crow said to Tang Ao after thinking for a while.

How could one thing be enough? Tang Ao secretly thought in his heart, although the Venerable Black Crow looked ordinary