"Do you know why they call this the End of the World?" The Librarian asked, changing the topic.
"Because it's the last place anyone would look? Seriously, I checked most of the world before I found you." Cain replied.
"No, it is because of the portal in the middle of the valley. The Youkai have sealed it for ages now, but it leads to the world where the Human Gods were banished to.
They left that world millennia ago, but the power level there is much higher than here. It serves as a relief valve of sorts, preventing anything too dangerous from existing in this world.
Do you see what I am saying?" The Librarian asked.
"You think that if I learn what is in those books, I will advance and be forced through the portal." Cain sighed.
That was a risk he had considered. This world had many limits on it, and he was quickly reaching them. Eventually, something had to break.