Xiao Yuanfeng frowned slightly upon observing Su Chengyu's current state, sensing that Su Chengyu was up to something. However, he couldn't fathom what means this young fellow relied on to bridge the vast gap in mana between them.
From their brief exchange of blows, Xiao Yuanfeng had already realized that, in terms of physical prowess, Su Chengyu indeed had the capacity to compete with him.
In terms of techniques, Su Chengyu's reliance on the Power of the Immortal Weapon combined with his quirky Sword Momentum, was similarly not inferior to his own.
But at the Martial Emperor Realm, the circulation of matured True Qi formed by nature within the body was far beyond what Su Chengyu at the Nascent Soul Realm could compare to.