Mine is Black Hammer. I have never gotten it or seen it drop in any of my runs. Also it's the only Crota weapon I don't have.
Edit 1: For all of those people who are saying Thunderlord, just a few hours ago I got it in IB.
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Need to have thorn. Lv.29. need 2 people for strike to get Thorn. Msg fiercewarrior21 for invite.