Some Body Refining Techniques used Flame Rules to temper muscles and bones, making them increasingly stronger through repeated burning and repairing. Others used Ice Cold Rules to temper the skin and flesh, allowing them to contract and expand in extreme cold to enhance toughness. Each method had its own rationale, and each provided him with new inspiration.
Time ticked by, and the night outside the window grew darker. Xu Wuyi was so immersed in the data that he completely lost track of time. After an unknown amount of time, Anna's voice rang out again.
"Grandmaster Xu Wuyi, it is already two in the morning. Do you need to rest?"
