Re: terrain and combat
Negative reinvig and encumbrance would be similar, right? The only difference being that encumbrance affects you during spell casting and melee combat, while negative reinvig would affect you each round. I think that makes sense for simulating fighting under extreme weather.
For simulating troops spending a month in terrain they are uncomfortable in, I'm gonna have to go with the "a few points of fatigue before" battle notion. It gives me images of soldiers who spend nights awake swatting mosquitos, or fighting off the wolves, or trying to keep from getting buried in snow drifts. By the time they get to the battlefield, they're already somewhat fatigued. That is such a tight idea.
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