So, I was with a group at the templar when we find a way to jump up and to the right onto a small ledge and that's where the video starts. I glitched into the vault so no chests spawned but I spent so much time finding that route, I believe there should be a chest. If anyone is willing to go in and search that'd be great.
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I ve explored it a long time ago. It s just another route towards templar from a higher ground area