As a warlock I've noticed at least personally that there are WAY more sunsinger-specific exotic armor pieces than for voidwalker. I'm not including subclass-neutral exotics. I might be uninformed about it, but obsidian mind is the ONLY voidwalker-specific exotic. Is there a reason to this?
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False there voidfang vestments and skull of dire ahamakara for the voidealker