A clever bit of locksmithing, forged from pure copper. Right-click the key upon any door or trapdoor and it will bind that door to the key. (sneak right-click the key to unbind it).<~><~>From that moment the door cannot be opened nor broken by anyone who does not carry its key. The key, now bound, takes on a faint shimmer and remembers the very coordinates of the door it guards. Can be put in your charm slot for easy access.<~><~>To release a binding, sneak and right-click the key into open air. The door is freed and the key forgets it, ready to guard another.