Where they went was not at the world barrier, but it was close to it. So their destination wasn't the very edge of the Central Domain. It was just remote and hidden part of the Central Domain.
On their way there, he pulled his son aside on the airship and said to him, "I believe that the inheritance is the damaged cave heaven world of a divine being, so it is going to be dangerous."
Slav nodded in understanding, but he didn't really understand, so he said, "What's a cave heaven world, and why is it dangerous?"
In response, Skarg rubbed his mustache as he said, "The cave heaven of divine beings is their internal world. I heard it was created in their mind. I don't know how they manage to do it, but I know that it is one of the foundations of the power of a divine being."
