What's obsidian mind do? And i think skull fort is a better helm then inmost light. I don't think warlocks have any good helms. The 2 chest pieces are much better. except I think skull of dire ahamkara might be better for a void walker (at least in pvp) then the vestments.
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It gives you more super energy for your next nova bomb by killing stuff with your nova bomb.
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I agree, discipline > strength