I've killed dozens of the Blades of Crota, and not one of them has dropped this weapon for me yet. I was thinking, since it is a Common and you have to complete the Raid on Hard to get it to Exotic, that maybe Xur should sell it? For maybe 7 Strange Coins? Just a thought...
Alternatively, they could have Eris sell Husk of the Pit once you get to Rank 4 of Crota's Bane, for the same price. What do you think?
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Unlike most of you guys I got it just playing the game... I didn't grind it so I don't know how many blades I killed but I'm guessing less than 20. It dropped off the one in the rocketyards when I was doing bounties leveling a new toon. [spoiler]just relax and play, it'll come eventually[/spoiler]