[@Cyclone] After reading back on the history, I retract my statements on hypocrisy. Your point of view (more realism, less absurdity) is consistent. I apologize for my assumption.

[@Wernher] My view is that the scales should probably be lighter, therefore justifying how the dragons can even fly slightly more and should be more heat resistant because it would make sense that a fire breathing creature would evolve skin resistant to its own weapon, however yeah, it should be weaker to Mithril. I'd say that a dragon's skin should be able to defend itself from small arms fire (pistols, bolt action rifles) but something like a 20mm autocannon should seriously hurting it, and things like a direct hit from a 77mm flak cannon or such should pierce its armour completely.