Cold iron, mined deep underground, is forged at a lower temperature to preserve its delicate properties. Items without metal parts cannot be made from cold iron. A halberd could be made of cold iron, but a quarterstaff could not.
Weapons made out of cold iron bypass the damage reduction of fey creatures, demons, and warlock's damage reduction.
Armor and shields cannot be made out of cold iron.
Notes[]
Crafting a weapon out of cold iron adds 5 to its difficulty class.