been working to unlock my bolt caster exotic sword and my fire team has gone three times with me throught the 300 sunless cell quest and we kill the arc knight just before alak-hul dies and well within the 30 seconds yet the quest keeps refusing to give me credit for killing alak-hul.
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Are you sure you are working on the correct sword? And are you sure you are killing the correct knight? Are you kill the Knight first or second?