The Heart Sword pierced Tian Xin like a bolt of lightning as pain shredded through his mind.

Tian Xin's mental fortitude had always been extraordinarily strong. Even when Sheng Yuanyi had struck him relentlessly with the Heart Sword, he had remained unshaken. Now, however, Tian Xin felt as if his mind was being torn apart.

"The Heart Sword?" Tian Xin's face shifted. He finally understood the terror of this technique. The fact that Sheng Yuanyi's Heart Sword had not overwhelmed his mind back then did not mean the technique itself was weak. 

On the contrary, the Heart Sword was in fact extremely powerful. After all, the most valued secret technique of the Heart...