With plant and animal domestication taking away some of nature’s most prominent mysteries, the last parameters that gave spirits their reason to exist disappear. This will have deep repercussions on the society that is emerging from the prehistoric world.
However, the spirits will not disappear completely, but will be granted a new life, with new functions in a new universe that will spread well beyond the enclosed world they occupied until then: they will be endowed with a new attribute, that of divinity.
Divinities stem from the world of the spirits, in a transmutation that stretches over millennia. Ultimately, they will form a coherent universe that will have for function to support the new conceptions taking shape in the human society.