I find it strange how necromancers can animate corpses, but not deanimate them again. I mean, i understand if you were some random Urist McDoe finding some populist magic newsletter in a tower, they wouldnt really know more than maybe just getting a corpse to twitch. But that big shot 200+ year old zombie master should be able to deanimate his minions, absorbing the evil. I would find that very useful in adventure mode when you want to visit a civilised area and you dont feel like abandoning your zombie army or having it wipe out that village you were going to shop and sleep in. Even more useful would be that if you absorbed enough magic to say, power a skeletal whale or elephant, you would heal, even more and you would start getting werewolf esque mutations, like extra limbs or parts of your body rotting away.
Even more cool would be visitting a temple to "become a priest", you know, atleast in brittish history, catholic priests doubled as vampire hunters. The high priest could teach you the ways of deanimating, send you on quests to purge evil places of their evil, like a tower or a tomb or something.
I know it sounds overpowered, but maybe if it only worked on weak and DIY undeads?