I've gotten three Rams from nightfall. It's just luck man. I can't get the voidfang
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I know it is. But, eh, still sucks. Was the only exotic I was really looking forward to in the House of Wolves apart from maybe the Nighthawk, though Hunter's not my main, and of course it's ended up being that one exotic that all my clan mates and even LFGers with >1000 grimoire score than me have. You'll get Voidfang eventually. Xur's sold it many a time in the past, and will likely do so again.