Half a month later, the convoy dispatched from Yun City successfully delivered two cannons into Su Yu's hands. Fortunately, with official documents and seals personally signed by Liu Su and Zheng Hui, the convoy encountered no inspections along the route.
Su Yu could already glimpse the potential of cannons through her experience with firearms. A cannon was essentially an enlarged firearm, and their underlying principles were largely similar. Therefore, for Su Yu, the principles of modifying them could be directionally accelerated through the Yin-Yang Engraving.
During this period, Su Yu had been kept extremely busy, with not a moment to spare. Aside from her daily cultivation, she spent the entire half-month refining Qi-Gathering Pills.
Chapter 140