Necromancer (noun)

1. A person who practices magic or divination, especially by communicating with the dead.
2. A sorcerer who communicates with the dead in order to predict the future or to learn secrets.

Origin:

From the latin 'necro' meaning 'dead' and 'mancer' meaning 'diviner or soothsayer'.

Examples:

1. People used to believe that the necromancer could talk to the dead.
2. She hired a necromancer to try to get in touch with her late husband.
3. The necromancer cast a spell to bring the spirit back from the dead.
4. The necromancer was rumored to be able to summon the dead for help.
5. Many people were afraid of the necromancer and his abilities.