Jacob's happiness instantly vanished the moment he heard the last part. He knew for a fact that Immortika wasn't lying—it never needed to.
"You know the origin of Art of Nature, right? Just what is it? I wasn't sure before, but now I think it's 'that' since only 'that' can have such power. Don't try to deny it. I know better than anyone!" Jacob said sternly, finally revealing his suspicions.
Although Jacob didn't believe it at first, as time passed and he completed one meditation exercise after another from the Art of Nature, he began suspecting that it might be a Universal Godly Scripture.
After all, the biggest clue was that the Art of Nature followed the same magic system as the Zodiac Plains. And now, knowing how vast the Zodiac Plains were—an entire universe—he mused that his old planet might have been part of it, too. After all, his planet didn't have the technology to observe the universe in its entirety.