Manufactured!
To be exact, they were refined!
These demons, rather than being a type of life, are more like a kind of biological tool.
From the moment of their birth, they had a detailed genetic evolution sequence and only needed to continuously devour the brain marrows of intelligent beings to perfect their thinking consciousness and nourish their "god" to further tap into their genetic power and obtain stronger forms.
This was Alkaid's understanding and cognition.
In the cognition of this demon, consuming humans initiated intelligence, and absorbing spirits led to transformation.
This is their way of survival, their way of growth.
Just like humans start with milk powder as infants and eat meals as they grow up.
The difference is, humans are numerous and varied.
Yet a batch of demons are all separated from the same life entity, gradually grow, and at some future moment, return to this life entity and merge into it.
This life entity...
"Demon Lord."
Alkaid uttered.
