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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You aren't alone my friend has tried to get it several times and his luck never comes out on top. Although I've gotten it multiple times that weren't necessary since I already have it , my friend has also gotten Gjallahorn multiple times and I can't either some people get lucky with certain aspects I guess.