Before Reverend Kongjian died of natural causes, he whispered these words to Xie Xun: "Even if you were to find your master Cheng Kun, your martial arts would be no match for him... unless... unless you can find the hidden secret of the dragon sabre..."
And so, Xie Xun spent the next 10 (?) years trying to figure out the hidden secret of the dragon sabre, with no luck.
Why did Reverend Kongjian leave behind such a mystery? Did he say that to isolate madman Xie Xun from the world, and thus, make the world a safer place?