Sossal is a distant realm north-east of the Great Glacier.
It is described in just a few paragraphs in AD&D 2nd's The Horde and the Grand Tour of the Realms and seemingly completely ignored in the 3.5e sourcebooks.
The wiki is also very anemic, and mostly mimics what is already in those two books.
I'm not much interested in crunch, only fluff (what?) is enough.
Is there any source material on that realm (beyond what is described in the ones above)?
Best Answer
In addition to the sources you've already covered, Sossal gets two brief mentions in the Sword Coast Adventurers Guide:
On page 11 and 12, it's mentioned as part of the Cold Lands, along side Damara, Narfell, and Vaasa. It's said to be a small nation that trades with the rest of the Cold Lands, but that's about it.
On page 149, its suggested as a possible origin for the Far Traveller background. Human natives of Sossal are described as having alabaster skin, white hair, and dressing in all white - as if they're made from the stuff of the Great Glacier.