Cold Marrow was one of the materials in the << Mortal Cultivation Legend >>. It was a type of chalcedony commonly used in alchemy and weapon refinement. The cold marrow only grew in the Ten Thousand Year Profound Jade. It was extremely precious and rarely seen by the common people. According to the records, there might be a small bottle of Cold Marrow in the North Night Palace in the northwest of the Great Jin Dynasty. It was regarded as the treasure of the mountain. As for the specific information and uses of the cold marrow, there was no more information in the search results provided so far. While waiting for the TV series, he could also click on the link below to read the classic original work of " The Legend of Mortal Cultivation "!