Okay, so I still have Eidelon Ally, and I was wondering, is there a way to get Necrocasm. Legacy engrams maybe? Little help here guys. Thanks.
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No, unfortunately vex mytho and necrochasm are unobtainable through legacy engrams. The only way to upgrade ally to necrochasm is to get the crux of Crota, which only drops from killing hard mode Crota. I believe it's a 1/6 drop rate, but not sure if that's just a rumor because I got it after about 13 solo clears.