I really don't know much about this as I haven't played with husks but someone in IRC mentioned it the other night.
Apparently when the necromancer dies you can sometimes get stuck in a husk that you can't kill. I think SageAcrin said that it may have to do with Dark Empathy reducing damage to zero.
Either way it sounds to me like this is almost like the alchemist golem thing where you take control of your golem after the alchemist dies, only here there's no self destruct button handy.
Here's a thread about it from another player.
http://forums.te4.org/viewtopic.php?f=38&t=41771
Getting stuck in Husks
Moderator: Moderator
Re: Getting stuck in Husks
fixed
[tome] joylove: You can't just release an expansion like one would release a Kraken XD
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning
