The soul of a mage has been trapped in his own bust for centuries. The bust is a foot in height and made of a dark silvery metal. It is well crafted, perfect in every detail of the mage's features. The frozen expression is one of shock. It was sold off in auction after the mage's unexplained disappearance and has been passed around as a curio ever since. The cause of his entrapment? He practiced in secret; none knew of his hobby. Being self taught, he was unable to tell that the spell he thought was for protection was actually for entrapment...
A culture must hide its hands in the arm of their clothing as a sign of respect and peace. When approaching somebody you show them respect by crossing your arms and hiding the hands in the shirt sleeves. Nobody worries about hidden knives and such, it is the threat of magic that this custom was created to prevent.