The belief in possession was already prevalent in ancient times. However, in the Christian view, every non-Christian is somehow afflicted by the devil, which is why baptism is considered a form of exorcism. Possession, accompanied by real phenomena such as poltergeist activity, clairvoyance, and abilities like psychokinesis or telepathy, is quite rare. The exorcism of possession is a very delicate matter that requires the exorcist to have significant psychological and physical stability, as well as a solid understanding of both psychology and medicine – and of course, magic, particularly demonology. However, there is no doubt that exorcism also has a psychological component. Conditions such as epilepsy, psychoses, and neuroses were attributed to it. This book provides a practical introduction and overview of exorcisms and the corresponding instructions on how to carry one out.