Su Xin had once meticulously studied several Five-Star Level Cultivation Techniques, among which were a few Swordsmanships, but solely in terms of Sword Intent, the strongest should be Ye Gucheng's External Heaven Flying Immortal from Baiyun City Lord.
The original External Heaven Flying Immortal definitely wasn't as powerful as what Su Xin was displaying now, because Ye Gucheng didn't possess Su Xin's terrifying Inner Strength.
However, the strength of the Sword Intent from External Heaven Flying Immortal was beyond Su Xin's imagination. As long as there was enough power to support it, this Swordsmanship indeed possessed the majesty of an Immortal.
Of course, the most direct understanding of this External Heaven Flying Immortal now probably belonged to Zhongli Wei and Murong Zongzheng.
Big Snow Mountain also had Sword Tao powerhouses, and even the Murong Family's own Sword Tao was quite powerful.
