Give Me a Demon Tonic, What Are You Afraid of If I Rebel?

Jiang Yan traveled to a world where demons were raging, and after eighteen years of hard work, he became a member of the demon-suppressing army. When a demon attacks, he is sent to the front line to fight the demon. But he never imagined that he would become the target of a deal between the city's top officials and demons, and become a stepping stone for their son's achievements. Fortunately, he has activated the system, and as long as he kills evil deeds, he can deduce the skills and increase his strength infinitely. Punish evil deeds, produce good results, and wipe out all injustices in the world. [Kill the demon king, good points +10] [Kill the city lord, good points +100] Consume good points! Your forging method is upgraded to the "Five Zang Forging Technique"! Consume good points! Your Mountain Collapsing Fist is upgraded to the "Seashaking Mountain Collapsing Fist"! ... Jiang Yan looked coldly at the disciple kneeling in front of him and said coldly. "You gave me a demon tonic, now you know you're afraid?" "No, you don't know that you are afraid, you know that you are going to die."