Talk:Iron Keep/@comment-86.89.243.103-20140826204405/@comment-4511886-20140826205903

It's part of the newly (today, actually) released DLC. If you don't have it, you probably can't do anything there. But if you have the DLC, you can open a door at the end of the room. I haven't played it yet though, so I'm just guessing from how the Sunken King area looked.