The "Book of Truth" serves as the Rune medium for Green's Forgotten Truth Spatiotemporal Sealing Technique, connecting to the World of Oblivion, and is one of Green's important sorcery instruments, possessing extraordinary value.
The former identity of the "Book of Truth" was the "Book of Black Rope" from the hands of an Ancient Stigma Wizard in the Black Tower, which fell under King Abaddon's Infernal Furnace of the Purgatory Giants, with exceptional material.
After the Black Tower's soul reincarnated, all the Heisuo marks on it disappeared.
And now, through the Eye of the World on the Face of Truth, Green actually discovered that the "Book of Truth" has a mysterious connection with something in the Wizard World!
"Black Tower?"
Green's eyes revealed an expression of disbelief.
