Just came up with this question in a game. Would a dragons kidney stone be worth anything? Are there other creatures that would have kidney stones worth a lot?
So dragons eat a lot of sulfur?
Those breath weapons gotta come from somewhere.
Wasn’t there some AD&D supplement that said dragons were conduits to the various elemental planes, and channelled their breath weapons straight from there? Maybe that was Grayhawk specific. I seem to remember it.
Third edition draconomicon explained the “draconis fundamentum” in a similar way I believe. Maybe that’s what you’re thinking of?
Then I would make the material from that plane. Ever burning coals, obsidian that is always hot to the touch, heat resistant chunks of brass. All as plane of fire example.
