For spellcasters. This appears as a gold torc of intricate design. It will radiated magic, if tested.
At first, this will allow the wearer to read the thoughts of others; these thoughts will be heard as if spoken aloud, so the wearer must be within easy listening distance. Upon first being worn when it truly matters, the thought reading capability will disappear, and the torc curses the wearer with muteness. The wearer will be incapable of making any sounds with their vocal cords, which means they will not be able to cast spells with a verbal component, nor activate any items that require a command word to be spoken.
The torc may be removed at any time, but the curse remains behind. A successful Remove Curse will return the victim's voice.
IMAGE: Newark and Sedgeford Torcs by Portable Antiquities Scheme, released under a Creative Commons Attribution 2.0 Generic License, modified in Inkscape by David