Lifespan and vessel.
No matter how many times he read it, what the contents implied was clear.
The Prea god-folk had lifespans, and rather than ascending, they died of old age.
Moreover, that some of them might still be alive after transferring bodies—every single detail was too terrifying to speak of outside.
"Do you know who wrote this?"
"No idea. That existed before I came into being. If it had been added later, I would at least remember who brought it."
Though his appearance and behavior were human-like, the Librarian was ultimately a spirit created along with the library's construction.
What he knew was limited to events around the library and the contents of books stored inside.
Unfortunately, there were no more books left by the owner of this handwriting.
"Still, thanks to this I learned something interesting. Lifespan, hmm. Now I can understand. Why my creator seemed so rushed..."