The closer you get to the magic barrier, the louder a whisper, just on the verge of hearing, becomes. It says

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The closer you get to the magic barrier, the louder a whisper, just on the verge of hearing, becomes. It says over and over, "The door will open to the strongest. Defeat the monsters. Get the key from the dungeon. The key is hidden between two rivers falling into the same lake, on its shore. Find it and come. The door will open to the strongest..."

The closer you get to the magic barrier, the louder a whisper, just on the verge… — Kingmaker