I'm a Good-for-Nothing Servant, Yet I Slay the Immortal Emperor with One Sword

[Invincible] + [Satisfying Power Fantasy] + [Decisive and Ruthless] + [Dominating the Ages] After transmigrating into a low-ranking sect disciple tasked with watching over the herb garden, Gu Chen assumes he’ll spend his whole life with a hoe. Until a crisp chime rings in his mind! [Ding! God-Tier Synthesis System successfully bound!] [Everything can be synthesized, turning the rotten into the miraculous!] Gu Chen (eyes wide with shock): This… this golden finger is way too overpowered! He tries tossing two withered weeds into the synthesis slot. [Ding! Synthesis successful! Congratulations, Host, you have obtained x1 Nine-Turn Resurrection Herb!] He tosses in a piece of scrap iron and a stone. [Ding! Synthesis successful! Congratulations, Host, you have obtained x1 Acquired Spirit Treasure: Heaven-Flipping Seal!] When the haughty inner-sect prodigy comes to provoke him, Gu Chen casually tosses out a “top-grade immortal pill” synthesized from mud. The prodigy says, “What is this? Are you trying to humiliate me with a mud pellet?” The next moment, the pill’s fragrance spreads for thirty thousand li, heavenly phenomena appear, and the sect’s founding patriarch emerges from seclusion and drops to his knees, begging for it! Gu Chen (shrugging): “I really just wanted to synthesize a malted milk ball…” From then on, the world has no more unremarkable outer disciples, only a synthesis master who makes even the emperors of the heavens tremble!