The silver foxhead medallion is a ter'angreal that was given to Mat Cauthon when he emerged from the Rhuidean twisted doorframe ter'angreal. It is one of his most prized possessions, and he keeps it on or with him almost all the time, though he did once offer it as protection to Elayne Trakand and Nynaeve al'Meara, and he eventually agreed to let Elayne study it in return for a favour.