Necromancer

n. one who practices necromancy, person who communicates with the dead in order to divine the future; magician; sorcerer; medium

Necromancy (Greek νεκρομαντία, nekromantía) is a form of divination in which the practitioner seeks to summon "operative spirits" or "spirits of divination", for multiple reasons, from spiritual protection to wisdom. The word necromancy derives from the Greek νεκρός (nekrós), "dead", and μαντεία (manteía), "divination".
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Noun
1. one who practices magic or sorcery
(synonym) sorcerer, magician, wizard
(hypernym) occultist
(hyponym) enchanter
2. one who practices divination by conjuring up the dead
(hypernym) diviner

(n.)
One who practices necromancy; a sorcerer; a wizard.
  

To dream of a necromancer and his arts, denotes that you are threatened with strange acquaintances who will influence you for evil.

See Hypnotist.