Even if you get this gun it's not a guaranteed necrochasm. You'll have to wait until hard raid comes out, then you'll have to beat crota, and then you have to hope Rngesus blesses you. They aren't just going to give you the mats after one win. It's the vex mythoclast of crota. Just saying, people are still complaining about not having that one.
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That's pretty much telling me I will be getting it guaranteed. Thanks for wishing me luck though.