[magic item] Key of Guidance

Key of Guidance

Some keys and locks have a spell bestowed upon them that enables the bearer to find the lock the key is intended for. These magical locks cannot be found normally without the help of magic, and even then the key is necessary to unlock it. The lock can be additionally protected by magic, and traps.
The bearer needs a general idea where to look for the lock. A map can be of help, or a description by another person. Without this and the key the magic will prevent anyone to find the lock thusly protected. If the lock is outdoors, travellers will be led around the area. If indoors, people will fail to notice it at all.