Skip to about 24:00 minutes into the video. Luke Smith then says this....
[quote]While a raid team is attempting to break into the Vault of Glass, you may stumble across.....and see these 6 players building something[/quote]
I don't know, but that sounds a lot like some form of creation mechanic/forge type thing.
Any thoughts?
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Nope, as stated bellow its a reference to the fact entering the raid is a puzzle that needs to be solved.