They were like all trolls, they turned to stone if exposed to sunlight. The only difference was that if Sauron's will was on them they didn't.
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I dont know if you can corrupt a Fea
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Well you certainly don't hear of the Fea of the corrupted elves going to the Hall of Mandos to be with the other elves.
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the body may not be totally immortal, but neither are the bodies of elves
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They can only die by grief or slaying which, while it is not true immortality, it is certainly more than what the orcs have.