"Ferried from an unknown time and place, a haunting presence has been detected. We must now confront the ancient threat growing at our doorstep"
Either the Witness is using the Vex on Neomuna to bring back one of his Disciples or the Disciple is a Vex from the Sol Divisive.
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If it’s a vex boss, then that would’ve been a huge missed opportunity to bring in something new that would have a huge yet interesting part in the story.