After so long, we now have confirmation on what Psions look like under their helmets.
This disproves that they are just another form of Cabal.
Props to the Live Action Trailer.
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This gives much more support to Ikora's statement in one of the new adventures about the Cabal being a collection of many different species. Especially since the definition of Cabal is: : the contrived schemes of a group of persons secretly united in a plot (as to overturn a government); also : a group engaged in such schemes