It's Invincible from the Start

He is the first person in the world and the best master in the three thousand worlds. He is the mythical Heavenly Lord, eternal and immortal; he is the Ancient Heavenly Emperor, who established the Heavenly Court and commanded the world, and no gods or demons dare to disobey him; he is the Alchemist, who established the Alchemy System and is revered and worshiped by the alchemists of later generations... He is also the emperor's master and has taught countless powerful emperors. Millions of years have passed, and there have always been legends about him on the mainland, but no one knows that the Emperor of Heaven, the Alchemy Ancestor, and the Imperial Master... Are the same person. And his legend is still continuing!