Yuan Ming shook his head regretfully as he played with the fiery red spirit stone.

Spirit stones can be roughly divided into five categories: gold, wood, water, fire, and earth, based on the different types of spiritual energy they contain. This spirit stone is obviously a fire attribute spirit stone, while his cultivation technique, the Nine Elements Formula, is a wood attribute cultivation technique, so he cannot absorb the spiritual energy from it to assist in his cultivation.

Yuan Ming put the spirit stone back into the black pouch and took out the book, eagerly flipping it open.

This book must not be an ordinary book if it was hidden in a black pouch.