[LintMan]

Originally posted by Cainehill:
But if it were done for all gem producing items, it might be an idea - no more black servant or other petty undead being used for fever fetishes, for example.

You'd still be able to drop them on Revenants and Spectres (cheap 9/10 death gem mage summons) pretty easily, and you'd get at least some value out of them as researchers while they also carry the fetishes.

But I strongly suspect that fever fetishes are going to no longer work on undead in the next patch. (I have no inside info: I just remember seeing a few forum Posts by one of the illwinter guys being surprised that they worked on undead, and implying that was in need of correction.)