Invincible Starts From Drawing the Blade

The Demon Emperor has descended, and demons run rampant. After hiding for half a year, Xia Nan finally drew his blade. Basic Knife Technique +1, upgraded to Drawing Blade Technique, easily slaying ordinary demons with a single strike. Drawing Blade Technique +1, upgraded to Berserk Slash, wantonly slaughtering demon kings, blood staining the heavens. Berserk Slash +1, upgraded to Ruthless Heavenly Blade, the celestial demon realm exploded, and the killing value reached its peak. Ruthless Heavenly Blade +1, upgraded to World-Destroying Berserk Blade, billions of demons turned to ashes, and even the Nine Heavens were pierced. But it seems like everything has just begun...