Best to start either with your ancestors, or learn psychopomp work from a core shamanism teacher (like the Foundation for Shamanic Studies) who will teach you to work WITH the dead instead of trying to command them (“use” them etc) and thereby, piss them off.
Yes we’re all badass black magicians, but why be on egalitarian friendly terms with demons and yet treat dead humans like slaves? JMO!
How much can you indulge in necromancy before it destroys your body?
Learned correctly (see above) working with the dead doesn’t destroy your body.
I have literally no idea what crazy shit people do that causes this to happen to them, but then I don’t understand why people sniff glue or watch X-Factor, so, whatever floats your boat.
Is the death current easy to control or doesn't take lots of training before you can stop it from harming you?
You need to be competent at energy work to be able to backfill with healthy living energy if you spend a lot of time with deceased persons. Balance in all things is important.
Lots of people are all “grr - death current - black dark blackness” and I’m sure that’s very nice, I personally have had some excellent success working with Buné on this, if you search my posts mentioning her you’ll see them, I can’t be bothered to do it and then format links, soz - been a LONG day.