It has been centuries since the cabal have enslaved us. All I know is Psion is cabal for "slave."
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Buddy, psion is the name HUMANS gave them. Psi is a word: any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like. Notice how they use psychic powers? Legionary, centurion, phalanx and colossus are also English words.