Number Five
Before William could open his ethereal mouth to try and speak, the scene faded away and he returned to the Boss room on the 15th floor.
Xonya? William didn't recognize the name, so he asked the System for some Potential Points.
-Xonya, a mythical figure known as the Queen of the Tundra. She died almost four million years ago in the void between the Grandiu and Torio Planes. I'm guessing that's the figure referred to on the tablet. Did you learn the Language of the Elements secretly?
The System didn't say anything about the vision, so William guessed that it didn't experience what he had just seen. Even though the System could see everything he did normally, it seemed that it didn't necessarily share all of his experiences.
William shook his head. How could he have learned an entire language without the System noticing? That would be more difficult than an impossible Quest!