
A Necromancer
The Necromancers were Seers who summoned the spirits of the dead to gather informations from them. The so-called Necromantic-priests also were an Order of Black Númenóreans. They were Sorcerers who sought to find eternal life, or at least stretch the life of mortal men. They were a Sauronite sect or at least largely corrupted by the Dark Lord's influence.
See:
Roleplaying[]
The Necromancer is also a playable profession in Rolemaster, a similar but more specialized class is the Creator.