I’m sticking with my prismatic/valence idea.
Their plan is independence and autonomy, that means bodies to inhabit.
Making a body and moving a paracausaly based mind should require both powers being used simultaneously.
The main question is how are they going to wield this power for their goal.
And since some are allies and some aren’t, it’ll likely be a ‘to save our allies we save our enemies to haunt us later’ schtick.
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It’s interesting, because currently, there are four Prismatic powers within the Universe, and only 3 within the system. That Includes - Maya with the Echo of Control, - The Traveler with the Aurora and prismatic energy vacating the Portal. - Eramis (Currently outside the Solar system) with the Echo of Riis. - And most interestingly, the Canonical character of the Guardian, who seems to be the only guardian and character as of now currently capable of using Prismatic, though it might be due to the fact that we are the Hero of the Red War and the “Travelers Chosen” as some lore seems to suggest. What’s most interesting about the Guardian is that the Guardian, along with the likes of Ikora and whatever the 80s dude name is, have been envied to Kepler by the Nine, and being that we are one of the sources/users of Prismatic power, it leads credence to your Theory.