"one of the reasons why you never heard much about necromancy" - that's a big assumption on your part!
It's called Spiritualism in the UK, though there is no reincarnation aspect, and it's been debunked for years.
I am as skeptical as you are of the INVISIBLE PINK UNICORN, please try and prove her hoofed holiness doesn't exist?"

R: I know that, you know that, but my experience of talking with Arabic people, necromancer is easyer to understand.
Will continue tomorrow ;)

Only God Can Judge Me
الله فقط يمكنه محاكمتي

I am you and you are me, if you love i love, if you suffer i suffer
أنا أنت, و أنت أنا, إذا أحببت نفسك أحببت نفسي, إذا عانيتَ عانيتُ