On the map there is an area that is inaccessible with two (or is it 3) extra guardians and several other bad guys I don't know what they are they just show up as red dots on the map. The only two ways there one is blocked by a locked door and the other triggers the cutscene thus ending the full mission. Is this an 'Oops we ran out of time' kind of thing or was it intentional as the map looks fully loaded there but no way to see .
Even replaying this in a different mission where you backtrack later yields no results. I wasted my time the first play thinking defeating all the guardians on the right side all the way back to the docks where you first started was the key to opening that door! Free spoiler: NOPE DON'T WASTE YOUR TIME!
there doesn't seem to be anything here