Psion
Adventurer
I don't see a problem from a balance standpoint, but I think special material lose their flavor if they can just be layered on.
Of course, I make alternate special "catch all" materials to help avoid the golfbag syndrome (mithril weapons are all good and silver, black iron is evil and iron) and I want to maintain the flavor of those materials being special vice just another mechanical wingding, so take that for what it's worth.
Of course, I make alternate special "catch all" materials to help avoid the golfbag syndrome (mithril weapons are all good and silver, black iron is evil and iron) and I want to maintain the flavor of those materials being special vice just another mechanical wingding, so take that for what it's worth.