A good camping-place with something extra: a gallows with a hangman, reduced mostly to bones and a few rags. It marrily hovers in the wind. Any manipulation will make it fall apart. An excellent camping place, except for the midnight hours, when ghosts of those executed haunt here. Some wail for their crimes, some re-live their execution over and over, some want to have a talk, and still some others want to scare the Living for fun.
Pick up a pathology/microbiology book, and add the diseases/syndroms to your game. Your players will freak out.
Coughed at? Diphteria. or tuberculosis?
Drunk from a muddy stream? Or just walked through? Well, let us introduce you to schistosomiasis...
Hit by a stream of energy? Too moch mana is ust like too much radioactivity - perhaps all mages could develop cancer early if too powerful...