I think the term is black magic and or witchcraft.

People do study it, people who want to know alittle about spirts, ect check books from the book store to do it. I saw a reinactic of someone trying to summon a spirt on the show ''A Haunting''. People who are into spirts, ect are willing to summon a dead spirt to talk to, ect. Sometimes the person could summon a bad spirt who is like a deamon and other times a spirt who is kind, ect. I find it odd, though it is a person's choice.

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Awesome Sig By Shikaino! l Adopted Loki-Sushi l Toonami:1997-2008