If creep was guessed as a lone guess I would probably have given it right, but it was one out of three guesses in the same post without any reasoning. I did say about that post, however, that "one of your guesses is so close I'm surprised you didn't see it". Sorry if I upset anyone.

Enough about that though. The immediate thought that strikes me is Bahamut and his questions before the fight. He doesn't show up physically before the fight, but his voice can be "heard". He questions your motives, and so your identity. The last line could be referring to that you have to choose the invisible option at the last question.

But Bahamut is too obvious, isn't he?