Who gave you permission to refine demons like this?

Demons devour humans, thus increasing their lifespan and spirituality. Humans refine demons, gaining resources to aid their own cultivation. However, Lin Sheng understands that the refining process for demons is incomplete, overlooking a crucial element. Having transmigrated into an ordinary human, he obtains the extraordinary treasure, the [Mysterious Furnace], capable of thoroughly refining the demonic energy, transforming it into precious essence, and condensing it into profound mysteries. It doesn't refine flesh and bones, but rather the true power of the demons! Using flesh and blood as cultivation resources, and energy as the essence for enhancement. From this moment on, Lin Sheng decides to relentlessly pursue the path of cultivation, devouring demons at will, with no turning back.