I'm seriously starting to think I'll never get it. It's the last thing I need and I'll have every exotic weapon.
Update: Just did all 3 Crotas for the week and still no Crux! Someone in my Raid group got their second though and they don't even have a husk of the pit! :(
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I get tons of husk of the pits, can't get the crux to drop, maybe this will be the week.