http://www.reddit.com/r/DestinyTheGame/comments/2ichma/about_the_fifth_chest_in_vog/
This is video proof of where to find this chest, THE FIFTH CHEST through the secret pathway and as for the requirements to get it well thats debatable so far it seems that it spawns only by preventing the first boss (TEMPLAR) from teleporting not even once, others says you cant wipe (everyone in the group dies), others say its a 'time based' thing and that the faster you get through that part (under 30 min) the more the chances you will get it, other just say its both preventing it from teleporting and not wiping!???? While the non believers may say its just a random chest that randomly spawns randomly everywhere through out the random vault??? (too many randoms?lol).
Well it is my task to put these theories to a test and stack them upon to see which one stands out, and so far keeping the templar from teleporting (not even once) seems to be the deal breaker! it will require some finesse and i hope your doing this in normal mode cuz i cant even imagine this on hard! Just have 2 titans in the two spots nearsest where he spawns and make them pop the shield while the others hit him hard! some one else can be in charge of minion duty and the other 2 can get the far right spawn and/or just join the other 2 titans and just see where he is teleporting. The guys with the shield just go around killing adds or just trying to hit him with special or help the other teleports, u will need to kill the oracles the first go but after u pop the shield you wont need to cleanse anymore as long as he doesnt teleport!
:D Let me know what you guys think
-
I think this chest has already been discovered. It only holds materials. It was much easier to obtain when we where able to push the Templar off the map. It's really no worth the hassle now