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The Iceland Kingdom, the Kingdom nearest to our town, and a small Kingdom where people had been surviving for years, hundreds of years, apparently, but that has barely changed in shape, form, architecture, or even territory. They seem to always have two duchies all this time, and they're not getting any more either…
They're a Kingdom of survivors, pretty much. To be able to withstand these cold temperatures and maintain the entire Kingdom for so many years is insane by itself. There are barely any invaders in these frozen lands, so it is understandable that they had not been invaded, but I would guess that magic and other things like those have kept them alive for a long time.