Zhu Xuan transmigrated through a hundred lifetimes and countless ordinary worlds. But on his final transmigration, he unexpectedly landed in a prehistoric wilderness, while the bound Myriad Worlds System counted down to its escape and severed their connection! Before leaving, the System gave him a parting gift: an immortal, indestructible body, endless longevity, heaven-defying luck, and three soul-bound treasures. Thinking he was in the age of dinosaurs, he hid in a valley for a thousand years, tearing giant beasts apart with his invincible body and living a quiet life roasting meat. Little did he know that this was actually the prehistoric world after the Dragon-Han Tribulation. When the breathtakingly beautiful and aloof Ancestral Witch Houtu appeared, gentle and compassionate yet bearing the supreme laws of earth, a peerless Ancestral Witch who commanded the land and cared for all living things, Zhu Xuan finally realized he was in the perilous prehistoric world! After accidentally killing the Black Bird Crown Prince, he was relentlessly hunted by the leader of the demon clan, who had sworn a blood feud against him. Though he looked like an ordinary man, he used only his unanswerable physical strength and a divine saber of ordinary iron to shatter a Taiyi Golden Immortal's divine ability with a single slash, instantly astonishing Ancestral Witch Houtu. Thus began his legendary tale of invincible survival through the prehistoric world's tribulations!