Thanks for the fast answer Brior (and others)! I will try to elaborate a little (also on the related subject "300 years in isolation"):
1) My main problem with the "20 years" is that then the player should be far from some of the first to exploring the FBL again. I really liked the feeling that the PCs are "in the frontline", some of the first getting out there for a try on the spoils and riches and stories of "what really happened". Now it´s more like the ruins and the aftermath of the war are already explored of somone else? The feeling of exploring and excitement of the unknown went out of the window when I heard of the "20 years since the bloodmist lifted". On all other places it says "recently"... and I don´t think 20 years ago equals recent even by the dark ages?
2) Was the lifting of the mist quite abrupt (I know it´s still out there at random encounters!) or was it more gradual? If it was more gradual, I can bye the 20 years-time-span.
3) If it as so murderous as written, and killed so many of them that not spent night at home, it will have really grave consecuenses for the peoples (at least humans!). According to my play-groups archeological expertice, if a group of people is under 500 persons, the get in-breed quite quick. And as I interpreted it, not many villages are over 500 persons i Ravland? As I like the inbreed-thing, it´s maybe a little harsch to have all PCs over 20 years really in-breed?
4) Trading/roads and so on. Long disctance trading networks were in effect during the early-stone-age. Roads wide-spread during early iron age. So certianly there was roads before the mist at least, the could of course be destroyed depending of the environment. If people discover that the mist is gone (Wolfkin and other nomads/Aslenes sure will do that) I think it will be a fast process to build up trading and communication. Everyone wants it because it really make it easier to survive.
5) 300 years of in-breed total isolation, what does it do with people? Here I think we can get good input from things that actually happened, the Lykov family in russian for example (https://www.smithsonianmag.com/history/ ... i-7354256/) The stories of the families way to entertain themselves, barefoot elk-hunting and the lone rye-corn is just to good to not be ripped of and carried away to Ravland! At least for me this kind of questiones needs to be discussed/answerd if I shall be able to "bye the story" and more important, convince my players of it!
6) One idea after all this questiones is that every summer there is a few weeks (maybe only two or so) of midnight sun. During this time, everyone can travel. With this "window of oppertunitiy" people has had some contact during this 300 years. Maybe festivals where people could meet and trade things, get pregnant and return home with some new blood to their communities (the father will of course need to return home an may only se the offspring maybe a week each year). Don´t know if this fits with the secret back-ground but it may loosen up some things in the history of Ravland!
Cheers and thanks for listening/Simpa