Touch of Iron

Lords and ladies of the fey courts are timeless creatures,
inured to many of the world’s threats. A universal exception
to this is weapons of cold-wrought iron. This metal undoes
the very fabric of a fey creature’s life as it blights their ageless
flesh. A cold iron weapon is treated as magical when used
against any fey creature, and is the only weapon with any
hope of harming the most powerful fey lords and ladies. Cold
iron weapons, however, are difficult to construct. The skill
and material required to produce such a weapon doubles its
price or adds 100 gp to the cost, whichever is more. Finding a
smith with the skill to make a durable weapon without the aid
of fire is always difficult—and finding one with the courage to
anger the fey courts may be even harder.