Eternal life! Caution until the end of time!

[Not a wish-fulfillment novel + mundane daily life + lighthearted and humorous + no female lead + no angst + a survivalist protagonist] Enter at your own risk. This is a novel about immortality told from the perspective of an immortal, spanning several great eras of cultivation. It begins in an ordinary mountain village, leaves its small realm, and enters a great world of cultivation, experiencing the era of vigorous development, the golden age of prosperity, the era of the collapse of rules, the era of dark turmoil, and the era of utter desolation... Chen Xun transmigrated to the vast and boundless world of cultivation, awakened the Longevity System, and was even given a longevity spirit beast as a companion. I, Chen Xun, have no interest in fighting and killing, nor do I want to provoke anyone. I just want to take Lao Niu to see the world's splendor. In a moment of inattention, he revealed the three machetes at his waist, and in another moment of inattention, he revealed his sixteen-pack abs. He slowly put on the bandit's hood, revealing a sinister smile: "I, Chen Xun, and Lao Niu are the most reasonable people." The entire universe trembled; he had... he had put it on. A Qi Refining stage fireball technique was suddenly activated, as if amplified thousands or tens of thousands of times, with endless karmic fire burning the sky and all living beings being annihilated... "Although you are very strong, you are not strong enough to make me use my third axe." —Nicholas, the notorious bandit, Chen Xun.