It's gonna be hard... Their scales are magic and a lotta other things proof. And they will go crazy. Hint, use physical attacks hard enough to bend iron. Another hint, when one of them goes down, so will the other. Warning, they will be angry. And crazy. Maybe we will see a fight of dragons.

and people. And villains and innocent civilians. Note, after they go into draconic form, they will be unconscious after destroying everything and tiring out. For around two months. Then the next two months they will be awake, but unable to use their powers and will be extremely lethargic. After the whole duration of four months they will finally be fine again. Currently deciding how to spend my time then. For all the good people, if you want you can go and capture them and everything after they go unconscious, just don't kill em. I like them, quite a bit.)