He was also very willing to transform the techniques of the Alien demons and the methods of the Heavenly Demon into his own Immortal Law and Divine Skills.
All these were not achieved overnight; he had been accumulating and perfecting them for quite some time.
Especially during the incident involving the emergence of The Fourteenth Demon Emperor, the Alien demons and the Heavenly Demon truly became his good teachers and helpful friends.
These one thousand Immortal Realm Runes were the knowledge that Wei Cheng intended to integrate. He had already mastered them in his Primordial Spirit World, as if he had absorbed all the knowledge from books into his mind.
The next step that needed to be done was to manifest that knowledge onto his Immortal Body.
That is, into physical reality.
It's like, if I learned nuclear fusion from a book, then I must be able to create a mushroom cloud by hand in reality.
One can imagine the difficulty of this task.