well The Kollector is in Goro's lair. Right before you enter the room where Goro's dead body is resting, you just have to stay in the room where Kronika's rewind time thing is and use (I think locked door) on the left, the you just walk down the corridor and you'll enter his room (there's bunch of weapong, hats etc in this room amd there's a table).
The misty area behind Forge is probably the one little area, which one of few elevators in the Goro's Lair take you there (I guess it's the elevator which is in the "dining room", I was there last week and I haven't been in that area since then cause there are just few chests)
