This is a question that has been gnawing at me more and more, after Eris said "The average Thrall doesn't live long enough to see their frame reform." It makes me think the Taken, or at least their host, doesn't have the means to survive for a long period of time, at least without doing whatever Malok has done.
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They normally have their life taken away by the darkness [spoiler]see what I did there[/spoiler]