In Uncle Nine's Jiangshi World, I Became an Immortal Before the System Arrived

Reborn as the Thunder and Lightning Mage Shi Jian, he discovers that he has no System and no golden finger. Fortunately, technology-based cultivation gives him boundless magic power, and scientific cultivation lets him reach the heavens. Thirty years later, Shi Jian has become an immortal, and only then does the System finally arrive, assigning him a mission to eliminate a female ghost... "Wait, I'm already an immortal, and you're asking me to eliminate some lowly female ghost? One sneeze from me would reduce her to ashes!"