I completed a GM Excision and didn't get the Ergo Sum catalyst, screenshot of completed triumph linked. I've checked my Ergo Sum and can confirm that there is no catalyst, any help would be appreciated!
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The triumph is bugged and can unlock from replay/narrative. Your game history has no GM excision clears Your most recent clear was Replay https://www.bungie.net/7/en/Pgcr/15403038919