On my planet, it is possible for one to have been forged with an ability to ignite flames or to have been outfitted with modifiers with similar abilities. I would not be surprised if organic races could augment their bodies in such a fashion.

["Magic" is a vague descriptor, no rules, no detailed explanation on its workings.]

I cannot say I have personal experience in such a matter, but what do we know of Bahamut? Is it possible to engage in combat against an Eidolon as powerful as he?