In the mission you go get the cloaking device so you can get crota's soul from his world, before you go into the room where you kill the 2 centurians, psions ,and the 2 yellow bar vandels, and after you kill them, you scan the computer and the mission ends, there is a giant room with this weird stair case, with a indent in the middle with a vent, like from Cayde's Stash, that you can see things behind, but not access. I've tried shooting, melee, grenades, and supers. So, do you guys now what it is? Edit- If you have your ghost pulled out, you can hear things if they can be scanned.