So, if I am right, this secret guarantees a exotic from the exotic chest in the wall area.
Behind the chest is one of those taken power tower things. You can manage to jump up on top of it in a small area. I did this, and stayed there for a minute or two. Suddenly, my screen flashed white for no apparent reason. My team mate arrived and we all opened it at around the time my screen flashed. All three of us got exotics from the chest. I need to test this further, and if anyone else can help do so it would be appreciated.
Edit:For the people who are saying it is a troll, it isn't. Im just stating what happened to me, and that I would like to test it further. I don't have a video because I don't have a capture card and I wasn't about to record the raid on my phone for no reason. If you want to ask the people in my fireteam who got the exotics I can give you their usernames.
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#Destiny
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To get gjallarhorn you have to 360 quick scope the VoG chest with dragons breath then run to the back wall, melee it and then run back to the chest for a kneeslide into chest opening before the solar flare runs out. Works every time. [spoiler]actually only once. Had a friend do this just messing around and got gally out of it. Pretty funny. [/spoiler]