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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I'm assuming most people know the chest you get for not letting the Templar teleport is on a timer. What if after getting the spirit bloom chest or the secret ascendant materials chest or even the exotic chest right before the gorgans maze sets a timer that you need to beat to find this chest.