Wasn't there Darth villages in WoM as a resource? Or maybe I have been confusing them with the Drota guys...
Yeah I know, even Tandis survives to help us in Gal Civ.
Using tech and that could be simply ignored. Also, even if they were the high tech races we know, imagine that the time travel used to get to Elemental did not allow them to bring anything bu themselves, how would they go about rebuilding a civilization that advanced? I think it like the Thallan (The Mantis dudes, I forget their name right now.) they came from further ahead, and they could not simply replicate their tech.
As for magic, I recall that some Drengin Tech did mention something along the lines of harvesting the energy that is released upon death, which sounds oddly similar to how death magic works... Not that important here, but a fun tidbit. (Assuming I am not confusing stuff. )
And besides, most races are human like already, and I saw how Stormworld even has some spidermen things as a race, if that is possible, I think it could be done. However I am aware that it would not be an easy mod.
I'm just throwing ideas around to see if someone finds them good enough to be made.