That's close to the old way people thought about it, around the time I was born, but that's changed since then. So it might be that souls in their worlds work the same as souls anywhere, and they just don't know it.
An alchemist would use them to power up their transmutations in my world. We homunculi eat them. I guess since we're created by alchemy, we run on alchemy too.
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An alchemist would use them to power up their transmutations in my world. We homunculi eat them. I guess since we're created by alchemy, we run on alchemy too.