Okay so I go into a the dreadnaught, and I'm in the Mausoleum area and right behind the Rupture off in the distance I see 2 platforms. So I scan for hidden platforms and there they are. So I jump around and get to the left platform and some weird indestructible thrall come out of a pit! They are called blind thrall. I noticed a treasure chest on the platform so I go to open it but it has a lock and just says "A scent is the key." Odd. Wonder what that's about.