What are you talking about? Voidwalker is useful in the VoG.
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If I have to choose between taking a Sunsinger or a voidwalker to the hard mode, I'm gonna drop the Voidwalker on his ass and take the Sunsinger Self Revive (and inf self revive)>the AoE burst
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VoG on normal i'll go Voidwalker and VoG on hard of course i'll go with Sunsinger because of the self-revive.
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Sunsinger is the obvious VOG choice though for revive. Especially on hard mode because there are no reviving your teammates.