Actually, just adding a layer of freezing effect to the Flying Sword is simply the most basic Enchantment Technique, and Luo Chao is confident he can do it. The difficulty lies in the fact that his Flying Sword has a Wood Attribute, which significantly increases the difficulty.
He bit open a wound on his finger, letting the blood flow out, using the blood as ink and the finger as a pen to inscribe on the sword's body. This method has its advantages and disadvantages. The advantage is saving a lot of time, allowing him to complete the enchantment at the fastest speed. The disadvantage is that it cannot be preserved permanently, merely temporarily producing a freezing effect.
Luo Chao's pursuit is speed. As long as he succeeds, he can control the Flying Sword to seal the poisonous gas outlet, thus completing his mission.
