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Also, Bungie again mentioned their non-Halo secondary project:
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IGN: GDC 09: Bungie Still Working on Halo 3 Content
Also announced was where the multiplayer map Guardian was from. This never clicked to me, but Guardian is no where in the campaign of Halo 3. Apparently, it was a part of a level of the campaign which had to be cut due to production time constraints.
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However, Murray did mention that the mission was home to a creature called, fittingly, the Guardian. A piece of concept art showed the Guardian as a deep green, angular machine-like object with a single glowing red eye at the top. It appeared to be a Forerunner construct and was reminiscent of an upside-down sword. According to Murray, you were able to fight the Guardian in the original level and could rip out its laser eye for use as a weapon.
IGN: GDC 09: The Halo 3 Level You Never Played