One of the most basic tenets of my Izan world-building is that souls do not exist. By soul or spirit I mean the generally accepted definition, essentially any sort of incorporeal entity. This includes ones that might be attached in some way to our material existence — and possibly survive it.
Perhaps I shouldn’t say they don’t exist; more accurately, there is no evidence whatsoever of them. In infinite existence, in infinite worlds, who can say? In that infinity we not only could but must exist again. Infinitely, perhaps! But that is not a soul, nor spirit nor ghost. It is solid material being.
As is everything else. Wizards do not send their spirits to other worlds. They send part of their physical self. The gods are material creatures. Even the little elementals that float among the worlds have a physical form though they are not quite ‘there’ when they come into Exura or another world and interact with its inhabitants.
We could use the old sci-fi cliché of them being ‘out of phase.’ It’s as good — and essentially as meaningless — an explanation as any.
All this does not prevent humans (and other mortals) from believing in the concept of an afterlife. But in many worlds they are knowledgeable enough of the gods and of the infinite worlds to recognize that no one knows what might await. Thus we have the Kamatian funeral rite I created for the third book of Donzalo’s Destiny, The Sign of the Arrow:
As an arrow flies
my soul,
into darkness, into night;
none whom I have left
behind
sees the ending of its flight.
We can, of course, use the term soul in a more general way, as when we refer to a person as a soul. It is what makes us who we are, our consciousness perhaps, that which continues however much our bodies may change. It is an abstraction, not a ‘real’ thing. Each of us is a human Ship of Theseus, every cell in our body being constantly replaced, yet this idea of us persists.
Until we go. The same with our ‘spirit,’ our spark of life if you will. They do not survive us, at least in the Izan mythos. As to our own reality, I’ll admit I cannot see the ending of my flight.