Weird: from an Ordinary Person to the Strongest in the World

The handwriting on that page is neater than the other pages, and it seems to have been added later. There is a strange symbol drawn on it, like an eye made up of several twisted lines. Below the symbol are a few lines of words: "The night when the red rain falls, Forbidden doors will open. Don't believe the shadow's whisper, Don't answer the call at the door. Find the forgotten mark, Only then can we move forward in the fog. "