From what I have seen, husk of the pit will drop from any hive activity.
Step 1, kill approximately 100 knights.
Step 2, visit the speaker then Eris morn
Step 3, complete The Abyss, kill crota on 390, kill omnigul.
That's as far as I have got? Anyone got any further?
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Jeesh, I was killing thrall to no avail. Where's the best place to kill knights? Can you farm them?