How did you know it keep it? Was it mentioned in an update? I got it while doing an Eris quest or bounty or it may have been a story run. It was just a day or two after the DLC., I was in the circle of bones when it dropped. I looked at it because it sounded like part of an Eris quest but nothing told me it was anything more than a common weapon. I DISMANTLED IT to make room for engrams. Not until yesterday did I know what I had done. There needs to be some clue on gear that is of importance. The only thing I saw was the mark in the top right corner, I just thought it was a post DLC drop, that's it.