I got mine after roughly ten runs in the Fist of Crota farm. Took it straight to the moon and WOKE THE HIVE to fill the upgrade node with Hive kills so it'll be ready as soon as I level up Eris. All told it took me just about an hour total to get the drop and the kills. I was lucky.
I watched one of my favorite Twitch streamers run Fist of Crota something like 106 times this afternoon without getting the drop.
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Is that streamer Goth?
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Yep. Took him 197 tries in total.
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I prefer to just kill the "Blades of Crota" that spawn on patrols.