Iron resource could become very interesting.
To fight a long war, almost any realm would have to buy it elsewhere, creating trade that directly profits from war.
That alone would become interesting enough for the trader.
It would also spark alot more wars and more intent to takeover other regions than gold and food producing behemoths.
Tried that, lost a few hundred gold and a few hundred bushels, as well as acquired a ban. Not too anxious to repeat that experience..
