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Have you noticed the necromancers in this game actually do call up the dead to fight for them? It freaked me out totally to see that, you have to ignore the dead NPCs and go after the necromancer, but it is almost impossible to ignore a bunch of people (you know you killed) attacking you!
Yes, I saw that in Skyrim, too! The first time, I thought to myself,
Didn't I just kill that SOB?? After the battle was over, I looted the bodies, and noticed that there were
fewer bodies than the number I killed. The next time I tangled with necrodudes, I paid closer attention and saw them
resurrecting bodies, and saw those same "bodies" disintegrate into ash piles when I "killed" them a second time.
Like Argis says, I'd rather fight bandits than draugr. At least bandits know to stay dead.