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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Yeah... I got it on September 12 with the first exotic engram I bought from Xur... Then I got an upgraded one with the same exact stats in the Nightfall. So I used the exotic shard of my old Praxic to complete my new one. Thing is my pride and joy. Sorry bout your bad luck, keep trying!