So in this video, Jason Jones talks about The Vault of Glass near the end. (5:45) It is labeled as the most challenging experience that Bungie has ever created (and we cant forget how difficult Halo 2 legendary was!)
The clip shows six Guardians jumping from block to block as they disappear in just moments. At the end of the clip we see them standing in front of a triangle-shaped door.
Personally, I believe that this will be the first time we face the Darkness head on. Remember those Pyramid ships that we still know nothing about? Well if they truly are the Darkness, it is possible that their theme is triangles and pyramids. Otherwise, I'm completely lost about what it could be.
Thoughts?
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I thinks it's a Vanguard mission. When you look on the navigator map in that video(also where people discovered the Reef) there is an icon called Vanguard next to Crucible. I think Vanguard missions will be end game quests that give lots of loot and maybe teams of 6 participate in.