Dimensional Spirit Core

Looking at the sphere-shaped rune core in front of him, a special glint flashed through his eyes. 

This, this thing was the rune core of a planet and contained the secrets of creating a rune core. 

It didn't have any color. It was practically invisible to mortal and only visible to those who had comprehended runes. It was constantly creating these colorless rune strings which made a slight change to the environment around it, it was by this that he was able to view it. 

After analyzing it for a while and determining that it was completely safe, he finally decided to absorb it. 

So, according to the manual of Dimensional Spirit Core, he should first enter the dimensional world before proceeding to the next step. 

"Go play" saying this to Fey, he finally entered the dimensional world.