Swallowing the essence of the sun and moon is a characteristic trait of demons as described in books. However, to be capable of this, it cannot be merely an ordinary demon; it must be one that is well-developed.
Because, birds, fish, and beasts, as well as various elements of the forest, are essentially determined at the moment they transform into demons.
Only a small fraction of them have ancient lineages hidden within their blood, and the moment they undergo metamorphosis, their inheritance will be activated, naturally granting them the skills to cultivate and breathe.
However, the majority of beasts that transform into demons have no method of cultivation. They continue acting according to their beastly instincts until one day they suddenly become aware of their difference, and only then do they undergo a change.
Yet even so, learning to master cultivation and breathing is nearly impossible. The vast majority of minor demons go through life blissfully ignorant.
