Necromancy why??

I wouldn't say necromancy is forbidden.Its more of...not practiced in modern age,you know.

And necromancy isn't really about rising the dead.
Its about having the perspective or perhaps divinity through the dead.

yes but there is a small section of necromancy that uses the "raising the dead" thing but its for Resuscitation

I missed that point yes.But it would be causing lots of karma.

not a lot of people want to teach you it because if not done correctly it can be dangerous.Spirtits arent alway nice and usually want something in return proper protection is needed and unless you have the proper equipmen eg a scrying object it wont work in contacting.Also summoning isnt a good idea,one the spirit you call upon could have been reincarnated 2 spirits dont like being disturbed for most death is hard to get over thats the whole point of the spirit world to prepare you for your next destiny and overcome your problems.baasically do at your own risk It's ten times worse than ouija boards and ive seen pretty bad things with those.