I call these black night vampires. They worship various dark gods and goddesses following the road to knowledge that is granted them. They are excellent in the dark arts and are charming with a love of pure enlightenment combinimg the left and dark handed paths. They are good in increasing the psychic and magic abilities of their human, helping you be more persuasive, elusive and use their abilities for your benefit such as wishes, manipulation, banish evil, provide chances for financial aid, revenge and planetary magick, reiki. Their morality is not the same as ours so word your request wisely.