That change was too weird...
He obviously slammed the Undead Essence into the Book of Death, wanting to have the Book of Death absorb it, but he hadn't expected this to happen.
This wasn't logical...
Lin Yun stood there, holding the Book of Death in a daze, a grave expression on his face. The change that happened to the Book of Death was completely beyond his expectations. The Book of Death frequently absorbed Undead Essence before, but this strange phenomenon had never occurred before. Even the notes Bane left behind didn't mention this.
'Right…'
He suddenly recalled that before they arrived to the Tulan Mountain Range, his Book of Death only possessed the Sage Chapter and the Truth Chapter. Now, there was also the Element Chapter. The changes that occurred to the Book of Death might very possibly be related to the Element Chapter. After realizing this, he felt that this change might be something positive.