Quote Originally Posted by Aotrs Commander View Post
What with their enormously heavy armour, heavy bones, complete lack of balloon shape and enormous muscle mass for crushing rocks...? (Remembering how dense muscle is...)

Nah, you just can't really explain big flying creatures away without some sort of magic, they're just too big and too far away in shape from actual flying physics. It's like you have to assume most giant insects must have lungs, because trachae simply don't work much beyond the sizes of conventional insects, or accepting FTL in sci-fi. It's one of those conventions you simply can't work around with massively changing the subject material. (Because a real flyer of anything approaching size would have to look something like a pterasaur or bird in proportion, and even then wold mostly by a glider.)
Dragon magic all the way down, man.