At the end of Insight Terminus, Ghost talks about the corrupted datafile 'OXA', someone or thing called Otzot, and a last lg-in from a user 'MSund12'. Was any of this resolved at any point since the strike came out? I admit I've missed a fair bit.
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Otzot was part of the midnight coup removing calus from power. She rebuilt the oxa machine which had powers to simulate the future or to see potential futures I forget exactly. Check destinypedia.