From the shadows Sheoreth appeared and sit on the chair as he smiled, confident he said "so simple you are, and yet you might do, what you fail to realize is that I am madness itself. I am a part of you, little one. I am a little shadow in your subconscious, a blemish on your fragile little psyche. You know me. You just don't know it"
As he put himself comfortable he said "you can skip all the parts and logic out the window. Whatever your "king" thinks he can do to convince me to leave my body will be a waste of time. Now if there are introductions to be made You can call me Ann Marie. But only if you're partial to being flayed alive and having an angry immortal skip rope with your entrails. If not, then call me Sheoreth, Charmed"
"Now, nothing I say will come for free, soon every scrap of information I give you will have a price. Every letter, every word I utter will be charged with a piece of your sanity. Like I told your king. Everypony plays my game willing or not" he was even more confident now