An ancient old man, whose seen his fair share of bar fights. Still vigourous despite his age, he knows the tales and legends of the surronding area almost as well as he knows the chipped steins of his inn.
When was the last time a character caught a cold or flu? Real people get them every now and again even with solid heating and dry interiors. Your characters are out in the cold and wet, and even inside is not always dry and warm. Imagine having to stop your dungeon crawl, sitting in a tight defensive position, while you all are feverish.