Apparently when I'm trying to melee kill cursed thrall it doesn't work at all I have tried my punches on 3 cursed thrall and it doesn't complete I really don't understand what's wrong
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It's a glitch. The kills only count if done on the dreadnought, apparently. Read it somewhere, but have not had time to test it.
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It wasn't working for me either but then I just randomly got it done meleeing cursed thralls on the The Sunless Cell strike.
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It's a bug abandon the bounty do tier 1 until you get a new one that's different