Alright, so a buddy and I are exploring the jumping area before the Gatekeeper. If you go to your left, there's a passage way that leads to another set of spawning pillars. You can use these to get to that abandoned gate to the far left. You can also, by scaling up the opening of the passage way, reach the far left side of the map, but it's very wibbly wobbly, and you fall through in some places. Now I'm not saying there is another chest, but I'm not, not saying that either. I just like the hunt.