Who are the forerunners

Community Halo Universe
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Im confused with the plot

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Read the Forerunner trilogy if you are really interested.

*Hint: they built the Halo rings and the shield world called “Requiem”.

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> 2796654947191286;2:
> Forerunner | Halo Alpha | Fandom

Nope, don’t go there…
Go here http://www.halopedia.org/Forerunner