It was a couple days ago (yes I know I said I JUST did it) I was the Fiend sub-class. It gave me the usual options and the warlock option about the pod being linked to the console next to it. So I went to the console and chose to inscribe the rune like you mentioned. That opened the pod for me. Well, after the "will the pod to open" wisdom roll bit you always have to do. I'm not sure what was different between us other than sub-class. Sounds like we had the same options though.
