I think I stumbled onto something last night. I don't know if it was a glitch, there seemed to be a lot last night, but somehow I extended the jumping puzzle. There were platforms spawning just off the ledge next to where everyone sits just outside of the hallway into atheon's room. I couldn't tell where they led and I was leading a group through so I didn't have time to explore but I took a couple quick videos and I'll upload them later after I get ready for work.
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That's the second jumping puzzle this thread has been talking about. Once you get to the entrance way if the Atheon room you can use the puzzle to get across to a vex portal which is on a giant rock but not active. It looks like a place where a chest would spawn but there has been no evidence as of yet.
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Watched the vid. Those are the platforms to get from the 'fake' 6th chest to the VoG. They go one way, not from atheon back to the cave
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Here's the video.