So now that the hive have the light and their own form of ghosts isn't it now possible for Oryx to return?
If they retrieve his body from Saturn and the Touch of Malice from Eris couldn't a ghost theoretically revive him like in the case of Savathuun and the Darkblade?
Having Orxy return with a mind wipe would be a powerful ally against the Witness if handled right
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I feel like the only way for him to be "rezzed" is to meet his definition. I don't think we would see him in game again, he would be, imo, THE fourth wall break. Thing is oryx probably wouldn't know himself at that point, it would take the sisters.