Chapter 624 Joining Forces to Slay the Demon

As the Black Emperor's voice fell, the eyes of the Ninth Heavenly Demon King fell upon Du Fei for the first time, as if only now did he deem Du Fei worthy of his attention. Before this moment, Du Fei had been no more than a buzzing insect fluttering before him. "A surprise!? Black Emperor, have you become foolish over these many years? A youngster who isn't even a Martial Saint, what qualification does he have to surprise me? Even the Martial Saint powerhouses, I don't know how many I devoured back in my day! If you're talking about him, this kid is indeed weak enough to surprise me! If this boy is the backup you're proud of, then I can't help but doubt, after all these years, just how much have you humans degenerated?" The Ninth Heavenly Demon, after observing Du Fei for a moment with his malevolent and wicked gaze, finally spoke with a sinister laugh.