C172
The last time he said it, Yue Xingchen calmly shared what he had learned from his previous fight with Wan Tianba to Jiang Feng and Yan Kuo. He pointed out that Wan Tianba's continuous stream of demon power did not seem to come from the Devil Soul Sabre, but was actually concealed within Wan Tianba's body. Based on how Wan Tianba was severely injured by Xu Qianloong last time