I have been grinding for the Duty bound for 14 hours (not in one session) and it has not dropped. While this kid comes in and gets it on his third run. I know meny people are frustrated, for a good reason. It feels like the more you play the smaller the chance you get it. I just what something like, after 30 nightfall in the week, you get the weapon. This should not be a thing
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You could do it on all 3 of your characters.