Streams and Rivers: The Peoples of Terafa

I've been gradually writing up my "Ultimates Version" of Terafa. It hasn't been going terribly well. However, I have managed to lock down the set of playable peoples in Terafa:

• Humans: Obviously.
• Dragonkin: The self-styled Last People, Dragonkin consider themselves the survivors of an ancient empire born from seven Progenitor dragons. Fleeing from an uncoming disaster, they chose the brightest and the best of their kind for the Return to the Egg, placing them in suspension for generations. Alas, they slept too long, and woke much reduced in numbers, pride, and power.
• Dwarves: Born in ancient times, dwarves have no memory of their oldest days. They were once an enslaved people, who woke in the depths of the Underdark with memories of skills but not of names. They then journeyed the bowels of the world to the surface. There are seven strata of dwarves, of which four are suitable for use as PCs: Hill, Mountain, Deep, and Sundered.
• Elves: An ancient but much-reduced people, elves are born of Queens and their consorts. They dwell in insular hives dotted around the world, constantly on the edge of extinction. There is effectively a single elven people.
• Gnomes and Goblins: Tricksters who once came from the Feywild, gnomes and goblins both deny it, but they are one people.
• Godborn: The aasimar and tielfings of Terafa are collectively known as Godborn. The youngest of all the peoples of Terafa, they first appeared in the Upheaval three centuries ago. Since then, each generation has been less numerous than the last, and so they are already a vanishing people.
• Halflings: There are four families of halflings wandering the roadways of Terafa. Though, as noted, these are indeed families rather than subraces.
• Half-elves: The children of parents of mixed elven and human heritage, half-elves can be found in both elven and human societies. They benefit from the traits of both their peoples, but never quite fit in with either.
• Half-orcs: In areas where human and orcish communities border one another half-orcs are sometimes spontaneously born to parents in either place. They may have mixed parentage, but more commonly have two human or two orcish parents. Half-orcs are prized in both communities, as they blend the strengths of both.

There are effectively two non-PHB races available in Terafa: Goblins (which can be found in "Eberron: Rising from the Last War") and Aasimar ("Volo's Guide to Monsters"). Ideally, I would also like to add some subraces - Deep and Sundered Dwarves, and one or two more suitable subraces for Elves. That said, given the upcoming changes in the new version of the rules, I'm disinclined to spend much time on that for now.