"Hmph. Well, it doesn't seem to matter to you then. This is a library.
First, since you somehow came in here without receiving my invitation, you need a complete analysis.
Sending you back out or neglecting you before I could figure out the reason might pose a serious threat to the city and the people in it. You understand the humanitarian ways of things, right?"
The person smiled and sat back at their desk.
"Let me introduce myself properly.
My name is Belief, the director and librarian of this library. The person who brought you here was my twin sister, for your information.
The books in this library are special. They are made out of humans.
...
*Brief chuckle* Did you really think I meant literally? No, they are memories, stories stored in books. The books show what people desire to see. Like daydreaming, in a way.
What a book can show is limited to information the original person had, so it has its limits. Still, its value can vary greatly depending on who reads it.
However, we can refine books here. Many have come here to do that.
We need to heighten the guests' emotions if we were to earn a refined book.
To draw out the emotions, we allow the guests fight our librarians, with something precious on the line.
Just as unstable as the library is, the librarians are incomplete.
To make them complete, you must pour books into them.
Then one day their true form and mind will manifest.
By making the designated librarians read the power and knowledge the books hold, the floors they're in charge of will be more and more complete.
The completion of floors means the completion of the library.
This library only has three floors now, but it will grow as time goes on.
The library is a space of unlimited possibilities.
Even I can't fathom its infinite power and space just yet.
That's why I am attempting to complete the library by filling the space with books."
Belief stood up from her desk, "But I am boring you, aren't I? Oh well. May I ask for a name?"
(Hurrah. Murph, you get the endless dungeon but in a library form. Through the use of books, you can create an endless amount of floors, bosses, etc. for you and whoever you want to join with you to brave and defeat. And since you need to feed it books filled with memories, you can replay bosses and events to your pleasure. Doesn't that sound like fun? Use the Library to extract memories that you want into books, and feed it into the library. I'll let your imagination deal with the feeding the library part. But hey, now people can have other people see other people's memories and live through them, and fight with them. And etc. You get it. Have your endless dungeon. Also, it can work on normal books, meaning you can playthrough fairy tales, if you want.
Oh, and to be clear, the limitations of Library are, you can't bring items out of the Library 'Floors'. Consider floors as levels. Like a story in itself. But you can't bring items, other than books and knowledge I guess, out of the library. Also, it won't give you protection against creatures. Creatures can enter the library as if they were you walking in. So yeah. Limitations. Also, creatures that come from the books can't go outside of the library. It's kinda an exclusive to the library thing. Just making sure people don't think they can hack into this and modify it as they please. Putting limits is necessary. And I reserve the right to put more limitations and rules on the library, just so you know.)