Please go read the 1st part if you haven’t, gives tons of context to what I’m talking about and what I found:
Cache 9: After the second restricted zone near the hung cabal ship.
Cache 10: To the right of the door to the scorn experiment room.
Cache 11: In the vent maze area, so from the spore you go to the right vent then left and you should see it.
12th cache(?): At the very end of the mission, behind the dead guardian.
The 12th cache seems to open 1 or 2 doors that lead down below to a room with the crown of sorrow. It seems that the crown of sorrow is somewhat tied to the catalyst or a mission variant, and maybe will be the last room to complete the catalyst/get it (remember these are only presumptions).
12th cache possible door.
12 cache doors leading to a room with a pile of dead scorn surrounding the crown of sorrow (found through OOB).
The crown of sorrow (found through OOB).
That’s the end of the guide, hope it helped!