Forerunner - Species - Halopedia, the Halo wiki

The Forerunners were an ancient species of extremely technologically advanced beings whose empire—known as the ecumene—encompassed three million fertile worlds in the Milky Way Galaxy. The Forerunners reigned for millennia as the ascendant

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Preceptor - Halopedia, the Halo wiki

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Reintroduction - Halopedia, the Halo wiki

In the depiction of species that were forerunners to humans

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Dazreme - Species - Halopedia, the Halo wiki

Halo Waypoint/Universe/Species — WikiHalo

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Leon-011 - Character - Halopedia, the Halo wiki