DragonOfTheAerie
Istari
I did give this a fair bit of thought because it did bother me (along with most of my fantasy world civilizations being roughly parallel to others here on earth).
My solution:
The fantasy world, many tens of thousands of years ago, was a near lifeless rock in another solar system - possibly another universe, which opens up weird cans filled with extra dimensional entities. Said near lifeless rock was terraformed by alien races about the time Cro-Magnon man appeared on earth. Once terraformed, said aliens began stocking said planet with lifeforms from elsewhere, including earth. First humans were imported something on the order of 6000 years ago, and other groups were transported via starship and portal every few centuries until about 1500 years ago, when the alien civilizations collapsed. The humans were mostly workers and experimental subjects (some of these experimental subjects were genetically given psionic ability, making them 'wizards,' while others became possessed by strange spiritual entities, and became elves.)
Anymore, the overwhelming majority of the aliens are long gone, though there is abundant interesting rubble to sort through in certain places.
My problem is that I can't figure out a solution without going into the need for sci-fi technology that my world doesn't have, or else having to change a lot about the story. I had several ideas:
-humans were created by the dominating race to be slaves from genetic information from the various races (didn't eliminate their rebellious, freedom-craving temperaments though, I guess...)
-humans were the evolutionary ancestor of the races (this could take a post-apocalyptic direction, which isn't that plausible...but, why do they still exist in the same form? Also it doesn't make sense at all.)
-the fantasy races were artificially created using genetic information from other sources, originally humans were the only race.
-there are no humans (my human characters would need to be changed to nonhuman)
-there are no nonhuman races (my nonhuman characters would need to be changed to human)
None seem favorable...
Mystagogue
Mythic Scribe