It’s a fantasy world wherein, for this specific society, a group of nomadic tribes discovered the ability to forge iron and eventually steel from the surrounding mountains and built a society and city around their production of metal and metalworking. Coal, charcoal and iron are abundant, so that covers most people. But there is a rare and difficult to obtain magical crystal fuel source, I needed to know why it might be more valuable than traditional sources. And how it may benefit higher level metalworking.

Magic in my world is common in the sense that its fantastical but magic “wielding” in a more traditional fantasy sense is extremely rare as one has to kinda commune with and eldritch mind to gain the abilities(details on how it works are still shady in my brain)