“ 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...”
“ The PCs see a large collection of urns in a pool of swamp water. All the urns are lidded and seem very old, what do they contain?”
“ People hunting for fish with arrows aim parallel with the water so that if they miss the fish they are aiming at they may hit another by chance.”