Necromancer

In fantasy and horror fiction, necromancers are often considered evil wizards and are sometimes said to have sold their soul to a demon or the Devil himself – to worship demons and evil gods (or Deities) – or to have been otherwise tainted by their evil practices. However, in some stories, necromancy is not inherently evil but instead simply another branch of magic.
In fiction, Necromancy is often not a form of divination but a discipline of "dark" or "black" magic used to raise the dead as "undead," typically as zombies under the necromancer's control, though the binding of ghosts and spirits is also common. Necromancers often become powerful undead creatures themselves; in modern fantasy fiction, the Dungeons & Dragons-derived term "lich" (originally a word meaning 'corpse') is often applied to such beings. Necromancers are, in rare cases, capable of raising the dead or restoring vitality to the living, though in some cases the life energy involved must be transferred from another living creature.
(da Wikipedia)

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