Using a person's life for gold cultivation?
Xi Sinong, whom Ji Fengyan had rescued by chance, was a genius gold cultivator. Even though his legs could not walk, he was amazingly talented in his gold cultivation skills. And Ji Fengyan knew some facts about gold cultivation because of him.
Gold cultivation in this world mostly required non-living ingredients such as ore materials to produce something new. The quality of the product would in turn depend on the ingredients and the level of the gold cultivation skills used.
But she had never heard of any gold cultivator using someone's life for gold cultivation.