Well, we do appear to have the Dvar. We know that the Archons, Elves and Humans, at the very least, are 'aliens' to Athla, and there's some good reason to believe the dwarves are too. It's possible that the dwarves of Athla are a refugee population of dvar that found itself in a position to ally with the Archons or Elves some time in distant history, or the Archons retrieved some dvar from the dvar homeworld before the dvar developed advanced technology, or some dwarfs made their way through the Shadow Realm into Star Union-controlled space and became dvar.
Alternatively, the Star Union could have been born from an Archon-cultivated human population that went industrial revolution rather than undergoing the apotheosis, leaving the archons watching over them scratching their heads and trying to figure out whether this was a good thing or not (after all, advanced technology is probably a big edge against the enemies that the archons usually fight, at least until said enemies start picking it up themselves, but it could be a sword that swings back if said enemies do start adopting it). Could be interesting if what brought down the Star Union turns out to be that the archons decided that the Star Union was a bad thing, and found some way to bring it down despite the technological disparity. (What if the archons actually know how to build advanced technology, but choose not to use it in warfare because they'd rather fight with swords and armour than more advanced technology, and they don't want to risk more advanced technology being acquired by their enemies?)
On the off topic question: There don't appear to be. Possibly because there hasn't been time to come up with any yet.