Everyone is speculating who/what the Guardians in the title is. Does it refer to Chief and Locke, or that Forerunner machine?
Well time to bring out the video again…
https://youtu.be/QULEcokHPQc?t=1m28s
There’s an answer there.
I was going to link to the same video. 
That giant bird thing, that’s a guardian.
> 2535457984174486;3:
> I was going to link to the same video. 
XD
> 2535457984174486;3:
> I was going to link to the same video. 
Cmon, just confirm or debunk us that the gigantic construct we are soo desperatly eager to know is or is not Medicant Bias!
Stop teasing us. ._.
> 2533274814635636;6:
> > 2535457984174486;3:
> > I was going to link to the same video. 
>
>
> Cmon, just confirm or debunk us that the gigantic construct we are soo desperatly eager to know is or is not Medicant Bias!
>
> Stop teasing us. ._.
Composed Mendicant Bias/Gravemind is my theory
And everyone is a Guardian of something. Chief is the Guardian of Humanity, Cortana is his Guardian, The Libriarian/Halsey are Guardians of the Universe, 343 Guilty Spark was the Guardian of a Halo Ring.
The Didact was convinced he we The Mantle’s Guardian but this is humanity’s to be Guardian of.