[quote=WilsonTurner]
Are all the creatures going to be the creatures we have today? No fictional ones? I figure that one would want to make the world more dangerous, to force people more along the beaten path or into the air, for fear of death and destruction at the hand of powerful, fictional foes.
[/quote]

That would be a significant factor in Army-based play if it was enough to cause development of airships. It feels like you really want some kind of megabeast in this, and barring genetic alteration you would rather capture them.