Display MoreNo Drop and maybe it was just new to me. Still thought i share
there is a whole area according to Toolbox behind the Abaddon shrine at Temple of the six Gods in Gate of madness
BTW is that door glitchable like in the SECRET DUNGEON from EotN ???
Also on the top left u can see there is an outpost "missing"
This may simply be the area where the mission's end cinematic takes place (depending on the cinematic, it may take place in places where we can't go directly).
"The missing outpost" is: Gate of the Nightfallen Lands Map here