There's an achievement for completing a raid without anyone in your Fireteam dying at all... that means not one person can die, no one can get spotted by a Gorgon and you cannot succumb to the Orcales.
If we can complete this, I think the final chest will spawn in Atheon's Arena.
What do you all think?
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The Gorgon maze has one mechanic everyone overlooks: Killing a Gorgon is a mechanic of the encounter. Kill one, and you don't get 'spotted'. It doesn't count against you. Plus once you do the chat window displays "The Gorgons are stronger" or something like that. This mirrors the Perseus myth in which Perseus kills a single Gorgon, and then escapes without confronting the rest. I'd bet dimes-to-doughnuts that if there is a super-secret seventh chest it has something to do with this. The results screen even tracks "Kills" and "Times Spotted" for the Gorgon maze. No one has found the seventh chest because no one approaches the Gorgon Maze with the myth the encounter is based on in mind. TLDR: much of Bungie's game follows certain myths or classic literature. The Gorgon Maze is no different, and most folks haven't noticed they've been overlooking an obvious clue.