At least on my game. Been trying since release date to get this damn chest piece and I can't ever get it. Every chest engram has turned to Voidfang Vestments, xur has been selling Voidfang Vestments all the time. RNG is beginning to piss me off so much.
I can't for the life of me even get one from nightfall. I get any other exotic that I don't want.
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If you're basing you're entire gaming life on this item, It might be time to move on and get other shit instead of complaining like the rest of the idiots here. There are plenty of ways to get items and gear besides JUST the nightfall, the nightfall CAN have a better chance but -blam!-ing barely. There is also better gear out there.