After Practicing in the Secret Realm for 100,000 Years, I Am Invincible

Lin Xuan, an outer disciple of the Qingyun Sect with mediocre qualifications, was accidentally involved in the sect's eternal secret realm trial. However, due to the collapse of the entrance to the secret realm, he was trapped alone in this chaotic space where time flows at different speeds. The spiritual energy in the secret realm was as thick as liquid, and there was no trace of the exit. After despair, Lin Xuan settled down to enlightenment and practice. He observed the laws of heaven and earth and created the "Ten Thousand Paths Returning to Ruins", tempered the Hongmeng treasure with ordinary stones, and tempered his body to be harder than the ancient artifacts. One hundred thousand years passed by in a blink of an eye, leading Qi, building foundations, golden elixirs, Yuanying... Until he surpassed the imperial realm and reached a level that no one could match. As soon as he broke through the wall, Lin Xuan held a rusty iron sword in his hand, and the sword's intent resounded through the sky. He crushed the Nascent Soul Genius with a snap of his fingers, annihilated the Demon Supreme with one finger, and made the heads of the seven super sects surrender. He used his spiritual power to reshape the destroyed Qingyun Sect, and then drifted away, leaving only a legend that "cultivated in the secret realm for a hundred thousand years, and became invincible once born", which has been circulated in the world of cultivation for a long time.