So I've collected every single exotic in the game except one, that being the Nechrochasm. I've killed Crota on hard 45 times and still haven't even sniffed a crux, having only ever seen two drop one going to my friend on only his second kill and he doesn't even have a Husk. I got a mythoclast after about 10-15 kills. So my question is why does the RNG hate me on this particular weapon when the only exotic I've had to buy from Xur was a Suros.
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Hang in there bro. I have been on a longgggg Destiny hiatus up until two nights ago. All of my friends got multiple Cruxes before I got any, and after several completions I gave up and stopped playing. Picked up two nights ago when my friend and I started trying to two-man raid. And on my third and final attempt for the week last night, my Titan finally got the Crux. Just be persistent, and the Necrochasm will come!