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Invariant Bias is a Contender-class ancilla created by the Forerunners to serve as the Custodian of the Absolute Record, an archive of information regarding Forerunner technology. In 2558, Dr. Catherine Halsey, who was in possession of the Janus Key, nearly succeeded in taking control of the archive. However, with the help of several Spartan-IVs, Invariant Bias regained control and confiscated the Janus Key. After the defeat of the Harbinger in 2560, Invariant Bias was contacted by Adjutant Revendicate, one of Installation 07's submonitors. Instead of requesting access, Adjutant Revendicate deposited information pertaining to the Xalanyn into the Absolute Record's archives, hoping it would be useful in case they were freed.