The Yin Yang Two Extremes Sword is best known by those who wield it; its speed is truly beyond imagination, making it the top choice for transmitting messages. Those who have used it all agree on its effectiveness.
The only two drawbacks are that to achieve such speed, the sword light is refined to pure light, making it difficult to harness the speed's augmenting power, and it's—too fast.
The sword light travels so swiftly that even Daoist Guang Cheng uses the Echange Skill for predictive control. Without sufficient proficiency in Yi Dao, one cannot utilize this message transmission method.
When the sword light shoots from East Kunxu to the Dinghu Sect, not even a breath passes before Jiang Li, moved by a sudden inspiration, uses divination to predict its trajectory and catches this Near Light Sword.
If the proficiency in Yi Dao is lacking, the sword light might easily fly tens of thousands of miles off course.
