“ A local fungus-breed explodes if hit or fallen upon. If there is any conflict between inteligent enemies,both sides are likely to use it to their advantage.”
“ A village where everyone goes blind sometime during puberty. What could be causing this? Perhaps something in their diet. Or some malignant gene. How would an entire village where only young childen can see function?”
“ Leader carries gold into battle with him. When he sees a great feet of bravery or valor he rewards them with the gold, or maybe a token worth some prize if they survive.”