It is interesting indeed, The way you describe dragons is entirely different from what I seen earlier. When I though of dragons before they eiter got 2 legs and 2 wings to walk with. Like the Skyrim dragons, or the ones with 4 legs and 2 wings which is like Eragon or Dragon Heart or both in the same enviorment like in my favorite movie, How to train your Dragon. It is also the Chinese Dragons but they are also know as wyvers and are the dragon from neverendingstory. I dont know why but I just love to find weak spots in anything. And I found it in every dragon I seen by now. But these ones dont have the kind of shells that can be bent but their smood skin still are protective. So it would be hard to take them from the outside. Dont know how if their spots like the human body is as well protected though. Are they still as protected? Like where the armpitt or where the troath and sholder is connected? As well as in a comment I just replyed to, are they vunerable from the inside? And is their shells vunerable to magic?
Because what I found out is they rely on eating a human to gain Mana, They got skin that is hard to peneltrate. They have a passon of eating people (this I can use as an advantage). They are big and strong (hard to trap but still not impossible). They love their friends, human elf and dragon (This is the biggest weak spott i found so far because in most strategy games I play on the enemys physological state, as bring fear in their hearts or make them go mad so they make tactical mistakes. So if I am able to capture their human/elf friends I can play on their fear, Hurting them so they hear it but keeping them alive will make them angry/sad/scared as well as killing them will make them Angry/sad).
Sorry for the long reply.