I found this:
"Osneg Vanar is a Human who hails from the far north, the lands of snow and
ice where Humans look so like [beardless?] Dwarves. Another Master Warrior
Mage, and a man of few words. As strong as he is at harnessing and as
deadly with [?], I expect he will be slain by a Guardian, an Immortal
jealous of his talent, or old age, rather than any mortal foe." in A Study of the Zaulfung Stones.

What group or clan is that? What other groups of humans are there? What are their physical types, history, cultural differences? Are any of them related to Wolf Clan? How many clans are there and where are they? Can we join any of these groups or Clans?

I'll keep searching for more hints between the lines of human history, but it would be nice to have something that directly addresses this.

Mists and Magic, Ocean Breazes, Deep Rivers Under the Sea, Trails Between the Stars: Where nothing is as it seems.