if you had done crota 7-8 times like you say a week then I doubt you would have asked this question.
but anyways i guess you know now...
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Thaloks. Kept having him appear in the first mission in the Dread but only was able to take down his shields.
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Can't kill him during the missions. Summon him in the Court of Oryx with antiquated rune. He's basically Crota, just harder.