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Gnosis is an achievement/trophy in Dishonored: Death of the Outsider.
How to Acquire
To unlock this achievement, Billie Lurk has to steal the silvergraph from either Sister Rosewyn or Roving Vice Overseer Cardoza during the mission The Stolen Archive. Rosewyn can be found on a roof on the last floor of the Royal Conservatory. Cardoza takes the silvergraph after meeting with Rosewyn and brings it to a projector on the first floor.