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Where did they put the Death Knights?
I agree with you on that. They were really good in the third game. But I think they were replaced with undead in a worthy way.
Once, one of my friends cast Vampirism on ghosts. They became, to put it mildly, very difficult to kill. Not only did half of the attacks miss, but even if they hit, the ghosts raised themselves back up. At the end of the battle, only ghosts remained. I think Vampirism on ghosts is genius.
Thank your friend. He came up with a good strategy!
By the way, what if you cast Dispel Magic on ghosts?
Added 6 minutes later
Chaos is cool, of course. If only you could find a Ring of Cold, and everything would be perfect.
Chaos for Necropolis... that doesn't seem right!