Special resources sounds really cool. I would especially like to see:
- meteorite metals
- adamantine (= the hardest stone in the world, harder than diamonds, perfect for arrow tips and armour)
- mithril (or it's non-Tolkien equivalent, but hey, this is Silmarillion, no?), could also be called noble silver, true silver or somethink like that
- white gold (for channelling magic, he he he, all Covenant fans ...)
- star fragments / star ashes
- natural artifacts, that you dig up from the ground much like a resource (but maybe only one time off), like the Illearth Stone in the Chronicles of Thomas Covenant. The game is called War of Magic after all, give us what we want!