Is it the datapad? After getting Izanagi Ada alluded to "one last mystery" and something about a key or whatever.
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Try this - [url]https://www.polygon.com/destiny-2-guide-walkthrough/2019/1/11/18177333/black-armory-izanagis-burden-mysterious-box-keys-location-volundr-lever-order-lenses[/url]