I've actually been thinking about this for several months.
Bori Fortress: Premise is that your entity rapidly dies out in worldgen and you're supposed to run the last bastion of the bori species. The Watsonian explanation was that you're a group of bori that awoke to "Neo"pia VERY soon. To the point that it's actually Archia.
Other entities are proto-Lost Desert types (analogous to humans in terms of ethics and governance), precursors to Altador and various psuedo-medieval kingdoms. Underground ones are Moltara and Tyrannia. Each one is represented by a single CREATURE.
This idea would probably have to wait for the Roll To Be An Owl update because crystal magic powers were a plot point in Hannah And The Ice Caves. Another idea I had was to base the magic system off of Neoquest elements (fire, ice, spectral, life and lightning) to reflect that it's a era before faeries rose to prominence. I also wanted to steal the idea of
mancer syndrome, where Archians without an associated element would become inhuman elementals if they used too much of any kind of magic. This would be the reason for using the Color system,to retain your sanity by impermanently jumping over on your own terms. Additionally your starting seven are either Ice or Relic depending on the biome where they started. While evil biomes are obvious, I don't know what you'd do with good ones.