After comprehending Enhanced Sword Aura, which is basically a superior version of Sword Aura that uses his soul strength instead of spiritual energy, Yuan's Sword Aura had reached peak masterly level, and his understanding for the swords also increased significantly.
[Grand Sword Mastery]
[Description: Very few Swordmasters have reached this level. Drastically improves your control with swords by 75% and increases all damage dealt with swords by 150%. Your enemies will feel more pain from your sword attacks as your damage increases. Your sword techniques will also have more impact. Requires no activation.>
