You try opening it carefully

Quest Text A very old book.
It is filled with discursive notes and diagrams.

Summary The five materials that make up the world are fire, water, wood, metal, and earth.
My research has proceeded smoothly since I have hypothesized that it is composed as such.
However, in the process of extracting the essence of earth NPC Item,
which I believed would be the easiest, I have ended up failing repeatedly.
Now, I started to ask myself
if the essence of Earth actually exists.
It is the home of life and the foothold of our civilization.
Everything that exists is on this earth...
(Diagrams and formulas of various creatures, earth, plants, etc. are drawn in the book.)
It was my mistake! The Essence of Earth is completely opposite to my hypothesis...
(The page is torn and cannot be read any more.)