Did we ever learn whi "Otzot" is from the insight terminus strike? I always assumed it was a codename Osiris used but don't actually know
Otzot is a Psion Flayer! Also called Freeborn Otzot. She was a genuis scientist who recreated the OXA machine for which Calus had her in his circle and freed her. She was the only freed Psion, hence "Freeborn." Otzot participated in the Midnight Coup which overthrew Calus, because he wanted to free all Psions and she didn't like losing her unique status. Most of the information about her is in the vanilla D2 collector's edition booklet.
Otzot:
We have no clue if she's still alive. I believe she is and that we may get to her if they ever decide to deal with the Psion stuff. We know a lot of the Psions split off from both Caiatl and Calus, led by Yirix, who now leads the Psion Conclave. Yirix and her Psions were the ones who made the prophecies we saw in Vox Obscura mission.