Ning Cheng shook his head. He had indeed never heard of Three Thousand Weak Water. Most of his knowledge was pieced together. The biggest gain was the basic weapon refining book that Zhongli gave him for free. If it weren't for the basic weapon refining book, he wouldn't know even more things. But the basics of weapon refining. There is no record of Brahma Bluestone and Three Thousand Weak Waters....