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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Maybe this is the reason they haven't fixed the missing count down at the end of the raid. You're supposed to go explorer for more loot?