You're inside Stefen—you're in his heart, the essence of who he is. I'm the Heart's Guard, and, as you can see, I've been put here to keep this path blocked off. I'm sorry that you're in this position, as I can't imagine it's a very comfortable one. To get out, you'll have to find your way to the Heart's Truth. That's the door behind me, and it's got a truth about me even I don't know! As you can see, to do that, you're going to need three keys.