I honestly think it would be to far fetched to try and impliment that as the reasoning behind why the break down.
You basically would only have to options: either make them so rare and or magical that they follow the normal rules for magic weapons or smiths such as the one in Beregost are making "inferior" ones that are corruptible by the iron.
I couldn't see the swords "breaking down" from simply fighting. Under that theory, then metal armor would also break down.
I was always of the opinion that it made no sense for metalic helmets, armor and shields to not suffer from the iron plague (I actually mod my games so that stuff breaks too).
That would drive me nuts if I had finally gotten a set of plate male or full plate and suddenly it just disintegrated. You are a much braver soul than I.
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You basically would only have to options: either make them so rare and or magical that they follow the normal rules for magic weapons or smiths such as the one in Beregost are making "inferior" ones that are corruptible by the iron.
I couldn't see the swords "breaking down" from simply fighting. Under that theory, then metal armor would also break down.
I was always of the opinion that it made no sense for metalic helmets, armor and shields to not suffer from the iron plague (I actually mod my games so that stuff breaks too).
That would drive me nuts if I had finally gotten a set of plate male or full plate and suddenly it just disintegrated. You are a much braver soul than I.