C91 Soul Devouring Dagger

Koo Di was seething with rage, his hatred for the Thunder Master consuming him entirely. By sheer accident, he had stumbled upon the Thunder Master's legacy. The teachings promised that if he mastered the Thunder Sword Technique to a certain level, he would be unbeatable among his peers. If he achieved perfection, he could even defeat those above his rank.

After a few days of intense practice