Chu Nan activated the Yin Evil Celestial Eye, and coupled with the first move of the Shifang Frightening Soul Sword - Soul Shaking - it gave Fang Sheng the illusion that the Celestial Eye could read memories.
In his terror, he unwittingly revealed his secrets, which, though thrilling, was unsurprising.
Moreover, even if Fang Sheng hadn't fallen for it, Chu Nan could have used the Yin Evil Celestial Eye to control Fang Sheng's Yin Spirit after his death to locate Zheng Yao and Jiang Yixing.
In the end, it just saved him a lot of effort.
Ignoring Fang Sheng's helpless rage, after the incident with Chu Jiang revealing the secret of his Treasure Blood, Chu Nan would never allow an enemy who knew this secret to have the opportunity to divulge it.
The Dragon Slaughter Tower erupted with terrifying pressure, crushing Fang Sheng's Martial Vein and Dantian amidst his screams.
