tired: iron is harmful to fae because of unspecified magic intrinsic properties
wired: iron is harmful to fae because of its chemical properties
inspired: iron is harmful to fae specifically because it is physically the stuff of the human Industrial Revolution, a social restructuring event with broadly devastating effects on human adherence to the core values of the fae. for this reason, iron is suffused with a palpable curse that arises from its position as a symbol of human callousness.