Just how advanced should I make the flying machines used by the ancient technomagical civilization before shit gets so out of hand that you can't include them in games anymore for fear of breaking the setting? Like, if you think about even modern day fightercraft, these things have some pretty amazing capabilities. Go round the world in a matter of hours. Missiles with ranges measuring in the hundreds of kilometers. Now imagine the impact of a magical, supposedly more advanced version of that on an otherwise medieval world. It's a cool background piece but you can't actually use it as anything other than a macguffin.

Where do you draw the line?