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Complete Battleground: Oracle on Nessus.
A detachment of Cabal forces has been sifting through Vex technology on Nessus. It's unclear what they're after, but it's not far-fetched to assume they're looking for something to offer Caiatl. Vanguard High Command is concerned the concentration of Psions among the detachment could allow them access to Vex probability algorithms and battle data.