"But I've learned all the codices." Dongbo Xueying smiled.
He had obtained the original Void Demon Insect Codex, and had also learned the other two mid-stage God Emperor-level codices, Heaven and Earth and Boundless. In this world, the supreme crystallization of wisdom left behind by Void Dao ascendants over endless ages was the late-stage God Emperor-level codex they had created, along with these two mid-stage God Emperor codices.
That late-stage God Emperor codex had never been passed on, so there was no way to learn it.
As for the mid-stage God Emperor ones, because they had circulated outside, he had been able to trade items for the chance to learn them.
"Draw upon the wisdom of other experts and make it mine." Dongbo Xueying sat cross-legged...