Try the Fist of Crota mission. There's a knight close to the starting point that drops Husk of the Pit. It's a lot faster than waiting 15min for another chance when you could just kill> orbit> go back down and kill it again.
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Is everyone serious when they say they've spent FOUR hours farming for it? Like FOUR real hours trying to get it? I play this game a lot but i'm not going to waste FOUR hours trying to get it. Btw i got two doing Eris bounties :)