Who are the Precursors?

Who are the Precursors? What is their impact on the universe? Will they play an important role in the near future? All is revealed in this video!
Next video will be a either what we can expect from Halo at E3, or the most likely playable factions we can expect in Halo Wars 2. Both are videos slightly different to what I normally make, but both should be pretty interesting nonetheless :)
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