The Stockwood Scrolls
Harper pins are given to members of some influence within the Harpers, never before they prove themselves through their actions through many months, and most often years of work for the organization.
They are fashioned from silver magically treated to have the hardness of steel, and are imbued with several magical properties, including:
The effects of a nondetection spell, protecting the wearer from divination magic
Making their alignment undetectable
Resistance to lightning damage
Advantage on saves against mind-affecting effects
Immunity to magic missile