[@Byte]

Apologies!  I possibly missed it out.  The differences are mainly linguistic.  The idea is they come from the North but migrated South in ages past.  Because the populations don't have too much contact with each other they have branched linguistically.

The Southerners are a bit more aloof from the affairs of humans.  The Northerners are less so and their culture has had a huge impact on the Pellmorwyr people in the North (who are reasonably isolated from the other human cultures).

BTW if you're interested in joining the discord we can help you brainstorm ideas, though no pressure!