I Have No Cultivation, Yet I'm Invincible in the Immortal Realm

I'm Liu Changsheng. My aptitude is heaven-defying, yet I can't cultivate. My master brought me into the sect and gave me all kinds of rare treasures to use! Unfortunately, I used them all without gaining the slightest trace of cultivation. I'm just a mortal, but no one can match my speed. The sect's elders are practically itching to dissect me. And aside from being unable to cultivate, I can master every other obscure discipline as soon as I learn it! Alchemy, artifact forging, spiritual cultivation, formations, and body refinement are all within my reach. Only cultivation itself remains useless! Still, I keep up an hour of training every day. I've been at it for a hundred thousand years, and I'm still a mortal. The sect elders have all either died of old age, been killed by someone else, or met with accidents. Even my master and fellow disciples are all lying in their coffins, waiting to die! I'm the only one who seems unchanged, still looking like the same twenty-five-year-old my master welcomed into the sect! Before climbing into his coffin, my master said something to me. “Disciple, though my cultivation is high, I envy you!” “Look at you. After tens of thousands of years, you still look the same. I wish I could become like you!” “If I can't break through, I'll have to lie in a coffin. You'll have to keep an eye on the sect for me. I've already spoken to your senior disciples!” Liu Changsheng was frustrated too. I have no cultivation, and there's no point in living like this! You're all lying in coffins, and I want to lie down too! But unfortunately, I can't fall asleep. It's so frustrating! He'd considered that maybe he should just die, but no matter how recklessly he tried, he just couldn't die. In the end, with no other choice, he became a humble sweeper, and the sect's founding patriarch.