[url=http://www.bungie.net/News/Blog.aspx?mode=news#cid32192]Let's open the Sack[/url].
As for the challenge, guessing at Bungie Lore won't be enough. We want to see your problem solving mojo. Team up if you will, but a winner is just a guesser without documentation of how they solved the puzzle.
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Idea: Since there are only the numbers 1-7 in the septagon, maybe we have to draw lines from each of the picture points (blue dots and the 4) to a certain number (one per arm), crossing out letters leaving us with the answer.