Cold Iron

The secret of Cold Iron is all but lost to mankind. Cold iron itself is iron that has been wrought into a useful shape, often a weapon, but without the use of fire or forge. Iron itself is anathema to the Sidhe, who cannot stand to touch it, or even be in its presence, and cold iron weapons are the only means of truly killing one of the Fey Folk.

Cold Iron

An Inconvenient Adventure Mystrunner