Hearing this, Xu Taiping suddenly frowned and looked at Great Emperor Mysterious Wasteland in bewilderment. "Since you have such a divine treasure, Great Emperor, why didn't you use it to kill those eight emperors earlier?"
In his view, with a primordial divine treasure like the Book of Life and Death, the Great Emperor could have wiped out those eight Demon Emperors in a single strike.
"Though This Lord paid the price of consuming an Immortal Body to bring this Netherworld Book of Life and Death into the Shangqing Realm when descending to the mortal world, I cannot use this treasure in the Shangqing Realm."
As Great Emperor Mysterious Wasteland spoke, he picked up a carving knife and carved a name into the Book of Life and Death, but the name was erased the instant he finished carving it.
"Why is that?"
Xu Taiping was astonished at the sight.
"When the Netherworld Book of Life and Death is in the upper realm, it cannot govern life and death in the lower realm. When it is in the lower realm, it cannot govern life and death in the upper realm."
"Moreover, in the upper realm, it can only be wielded by someone from the upper realm. Likewise, in the lower realm, it can only be wielded by someone from the lower realm."
Great Emperor Mysterious Wasteland put away the carving knife and explained to Xu Taiping in earnest.
"So that's how it works."
Understanding dawned on Xu Taiping.
"So you want me to carve the names of those eight emperors into this Book of Life and Death?"
He sought confirmation from Great Emperor Mysterious Wasteland.
"Exactly." Great Emperor Mysterious Wasteland smiled and nodded.
Then he lightly tossed the carving knife in his hand toward Xu Taiping and gently pushed the Book of