Mysterious Stranger

Listen carefully and don't interrupt. And don't stare at me! I am visible only to you, I don't exist to others. So simply shut up and listen.
I know that you've already noticed people's strange memory gaps. That's just the tip of the iceberg. Let's just say it is a small error that made its way into robust calculations of our old acquaintance.
You probably don't remember me? Oh well. It is not important right now. What is important is that you know that you're in great danger. Let's just say that the owner of this paradise is saddened by your unbridled curiosity and wishes to get rid of you. Don't believe your eyes: everything surrounding you is a trap for naive fools, and the trap door just shut itself. Whether you believe me or not is up to you. But if you want to survive, then meet me in a place called the Cave of Elements, and I will show you just how deep the rabbit hole goes.

For a moment I thought you would not come. Well, you made the right choice. I am not disappointed in you.