“ Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.”
“ You find a patch of edible funghi. They taste well and all, no ill effects. UNLESS you consume some beverage, even 3 (three) days after eating it. Then you become really sick with pains, vomiting, all the fancy stuff. As a gift or good meal, it could be a cruel joke or to make sure the heroes spend their time focused on the mission. And the fine soup you had in the inn yesterday could have some in.
(Inspired through a real-world fungus. Was really used to cure alcoholism.)”
“ What to export or import....
Fabric: wool, linnen, silk...
Wood: raw-material, furniture
Stone
Marble
Coal
Metals: iron, gold, silver, copper...
Wine, beer, mead, spirits...
Animals: horses, sheep, swine, cows...
Weapons
Armour
Slaves
Salt, spices
Cheese
Grains
Coloring-powder (for fabric, ink...)
Yarn
Raw-material to make fabric: unprocessed wool, linnen, silk...
Leather
Glass: Windows, figurines, glasses, raw-material...
Shoes, clothes
Tobacco
Medicines
Poison
Coins
Pottery
Musical instruments
Tea (not sure about my spelling here, but I mean the hot drink Englishmen drink instead of coffee!)
Gem-stones: diamonds...
Dried meat
Dried fish
Dried fruits
Flour
Chocolate”