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Welcome to Halopedia, the Halo wiki and definitive source for Halo information that anyone can edit. This encyclopedia is edited and maintained by a dedicated group of Halo fans! We are currently working on 16,000 articles created since November 4, 2004, and you can help us! Sign up or login to receive exclusive features and customization. Check out the new pages, recent changes, and statistics. Don't know what Halo is? Then read our summary here! If you've never been here before, you can find out more by checking out the about page. You can also find us on social media or our Discord server.
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Article Improvement Drive is a community project to improve the wiki's content through bringing articles in dire need of improvement—from cleanup to content expansion and updates—to everyone's attention. Anyone is welcome to participate in the project!

A small sampling of articles in need of new content:

The following articles for Halo media could use the addition (or completion) of a plot synopsis:


See the AID project page for more information!
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HE20 Absolute Record Ancilla.jpg

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.


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