There are some skills that are not commonly taught to people. Some of these are so rare that only a few people actually know the secrets of the art and fewer know how to teach it. Others are only taught within certain Guild or groups. Some can only be used by the people gifted with the skill and cannot even be learned by others. The following is a selection of these skills, some of which can be learnt and some that cannot. In each case, the requirements to learn these rare skills or magic are explained.