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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 15,755 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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Landing on Halo.

The Battle of Installation 04 in September 2552 was a turning point in the Human-Covenant War, setting in motion events that would lead to the Great Schism and ultimately the end of the war. It began when the UNSC Pillar of Autumn, fleeing Reach along an ostensibly random trajectory, stumbled across and subsequently crash landed on an unidentified artificial ringworld: Alpha Halo. In the ensuing battle, it was revealed that the ring was part of a failsafe contingency to prevent the spread of an interstellar parasite, the Flood. If the need was dire enough, the Halo Array would sterilize the galaxy of life and deprive the Flood of its food supply. With the Flood released upon the ring and its caretaker threatening to fire the Array, it fell to John-117 to destroy the ring to stop its firing, contain the Flood outbreak, and prevent catastrophe. For this, he became a legend among the UNSC.

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This galaxy is vast; its wonders and beauty are almost unfathomable. But the galaxy also hides dark secrets, some of which have lain dormant since the beginning of time itself. There is a danger in secrets, both in seeking and in knowing. Some things are meant to be hidden from view. Some mysteries defy understanding, and sometimes even the things we think we know are untrue. Some secrets should remain untouched.
Cortana, Origins


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