FWIW, I played a good Necromancer a while back in RM, and he was a surgeon that actually was good at it and never tried to accidentally fail to gain bodies. He'd go down to the charnel house (this was in a big, monster-disctricted, seedy city) and pay or sneak out bodies that were unidentified and about to be incinerated.
He also had a strict insistence that only the naked skeleton was appropriate to raise, as then it was like a moving artwork (he had art all over his ground-floor apt) and so he had a half-orcish butler skelly, and then 2 human skellies that dug him a basement lab. He was visited by the odd demon and monster and other necros, etc. either assuming he was bad, or trying to tempt him or just pushing him around but my guy was more a snooty connoisseur of anatomical art rather than a classic creepy necromancer. Dressing up his bodyguards was funny too.
The one thing we all retained from him was the line I gave him when foes were dying or doomed which was "Here, hold this brush" where the brush was a toilet brush they'd be using forever very soon.
It can be and was done, but the old RM books didn't even try to support a PC Necromancer.