C478 Mystery of Core Formation

"I know a bit about the methods of Immortal Spirit Sect, which is to view the human body as a cauldron, to refine the body and mind, to condense them into a pill, that is the same as training with one's life and death, to break through the core, to perish through the core, the relationship between the body and the golden core is inseparable, to prosper together, to the detriment of both sides, to