Tossing this coin into any well will grant you a wish. Any wish you could desire with in the power of Tiamat. However your wish will have dire consequences depending on the wish. Any other mortal whom makes a wish in the same well their wish will also be granted with dire consequences. The wishes will continue to happen until the one who used who threw in the coin removes it. Nobody else can removes the coin by any means. When the coin is removed all wishes are revoked.