I Have Become a Giant of Demons, and Darkness Is Coming?

My name is Xu Yang. Once upon a time, my dream was to become a talented martial artist. Later, everything was ruined. The abominable longevity medicine, pretending to be a martial arts genius auxiliary system, caused me to fall into the devil's path! Immortality Medicine: "Xu Yang! How can you blame an injured and amnesiac medicine of justice!" "The cult's medicine of justice?" "Slander!" "You are the biggest slander against Justice Medicine!" "Wait a minute! Xu Yang! Why does my name appear in your confession??!" "Write less?" "Wrong writing! For example, the first one, join a powerful force, what's the problem?" "A powerful force fighting to revive the dark world, is that right?" "Then Article 108, let..." ..... Years later, darkness falls. Xu Yang climbed to the Evernight High Platform, and he heard the name being sung in the dark world. Spirit Lord - the ruler of Guijin.