Heraldry is the knowledge of arms and of the rules governing them: what may be borne, by whom, in what combination, and what a difference in the field or a change in the crest is announcing to anyone who can read it. A Heraldry test not only interprets an achievement but frequently reveals the history behind it — a marriage, an inheritance, a bastardy, an attainder.
That is why the skill functions as a nobility’s folklore, and why a herald’s office in practice extends far past scholarship into diplomacy and the carrying of messages between people who cannot be seen to speak directly. Foreign arms carry the same distance penalties as foreign folklore.
Execution. Actually setting out an achievement — on a shield, a surcoat, a seal, a roll of arms — is a Drawing (Heraldry) Success Value test read on the standard table. The herald supplies the blazon; the draughtsman’s hand decides whether anyone can make it out at fifty yards.