If your campaign world has chess (and it should be or how are you going to put the obligatory chess puzzle in your mad wizard’s tower) then why not use this little piece?
Chess is a popular game among the nobility and the educated classes. The game is played slightly differently in different regions, but it’s mostly the same everywhere. An interesting innovation of unknown origin has been making the rounds. It’s called a “queen” and it replaces the “general,” a fairly useless piece.
These queens are enthusiastically introduced to players by traveling scholars, merchants and diplomats from a nation to the south. Their Queen is a co-ruler with her husband, which is quite scandalous up north. She has had chess sets with queens made to be given to royals, bishops, wizards and professors. Her agents visit, present the gift and explain how the new piece works. It is being adopted eagerly, and it improves (and shortens the playing time of) the game.
Each of these black queens is a tiny stone golem that will respond to a specific phrase. If the phrase is said during a game, that night the piece will animate into a small stone golem and kill the set’s owner, family and any witnesses. This phrase could be said by anyone, even someone who is not playing but is nearby.
Each of the white queens magically transmits any sound it hears during a game to a clairaudient in the Queen’s employ.