Help with the dying planet

I use Imgur - it's a free account. Without knowing exactly where you are, it's hard to say what you need to do to progress.

After working your way down into the bottom of the builders chasm (there are two ways to descend into it near each end), you then have to fight remmant and other creatures to get to the point where Mithrava is marked in your map.  There is no obvious exit to that area, but if you use your scanner, you'll see some yellow conduits that will lead you to a hidden remnant console that will open up part of the wall.  From that point, you'll have to jump upward through the center of the column you until you'll find yourself near a gravity well that will move you horizontally (not vertically) to a point where you'll start actually climbing the Mithrava tower.