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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I got it as my first exotic! I believe I bought a chest engram from Xur as I didn't want the Vestments, and I got it! After spending 2 months trying to get the VoG raid helmet so I could actually use it, I finally have the Crota raid helmet and upgraded it so it should finally get some use!