This took a lot lol (info in comments for the dumb ones)

Library of Alexandria - Legendary Artifact
We will divide this into multiple sections for easy-ish reading.

The Library of Alexandria is an extremely powerful Artifact, even if it's not an object but instead a place.
The Library is located in another dimension only accessible by the owner of the Artifact, accordingly named The Librarian. The Library appears to have a sort of "semi-consciousness", it follows orders and tasks given by the Librarian. This giant library is divided in a few areas:
-The Entrance
-First Floor
-Second Floor
-Forbidden Floor
-Third Floor
-All floors past the third

The Library entrance appears as an ancient library, filled with scrolls and papers(as shown in the image), this area is particularly small and only extends for a couple tens of meters.
Here more ancient information can be found, particularly about Egypt, Greece and other various historic civilizations.

The First Floor has a rather more modern look. This floor is rather finite and expands for a couple million kilometers. It is filled with books regarding all sorts of stuff, usually related to Science, History, Languages and other various but useful subjects.
This floor is connected to the Entrance.
To reach other floors you need to take a stairwell that brings you to lower floors.

The most peculiar thing is that you can find maps of each and every planet inhabited by an intelligent species, and also detailed maps of their cities and undergrounds if thet have them.

The Second Floor is a bit messy and has a LARGE focus on books.
This Floor is one of the biggest and contains all information regarding Earth, the Solar System, the Milky Way, and Andromeda galaxy.
If you want to study something deeply, this is the floor for you.

Because of the messiness, the Librarian can order the Library to move and shift around to the Librarian's desire.
Forgot to mention this but on the first floor you can find also various artifacts, on this floor you can only find books, all types of books though.

Certainly the best gimmick of this floor is the absolute silence and the smell of fresh books.
Go on you nerds, the library is big enough for all of you.

The Forbidden Floor looks like a church but no saint stuff, only bookshelves and artifacts. Only the Librarian can enter this floor, no guests or other Librarians.

The Books here contain info that shouldn't be shared to anyone, not to mention, this floor is incredibly dangerous.
If you're not in one of the main halls(as shown in the image), you're probably in the smaller maze like hallways, being attacked by countless small monsters trying to rip you to shreds.

The information here is mainly about forbidden combat techniques or forgotten overpowered transformations. If you want to get stronger, this is probably the floor for you.

The Third Floor is the most versatile floor. The look may be boring but it's certainly one of the most useful if you don't know what you're looking for.

Here the Library can change, shift, transform at will, no need of a Librarian's input.
Be careful though, this place is a maze and if stray too far from the main path, you'll very likely get lost.

The information here is primarily combat techniques, diaries of people's lives and powerful Artifacts.
Isn't it stupid? You find artifacts on the first floor but you find the most information on them at the third.

Now that we're here, I'll explain the Librarian stuff.

The Librarian has complete control over the library, he can make it shift, transform and deliver information to him, but he's not the other guy.
There's the other Librarians, which you can call Assistant Librarians.
They go from Apprentices to full on Masters.
Other than that there's the Guests, Guests can only be invited by the Librarian and usually aren't random people.

Any floor beyond the Third is utterly boring. You can call these "Remnant Floors"
They're mostly empty but they gradually fill up.
By far the most interesting is the 5th, where you can find a large open area where you can train and fight.
Get it?
Get artifacts from the first floor, get the information on the third and train on the fifth.
So stupid.

Anyways, they are pretty big in size and are also where the Assistant Librarians can find their rooms and also where Guests can find Guest Rooms.
Usually an Assistant Librarian gets assigned to one of these floors and sorts out books or write some.

Let's talk about the Librarian.
Other than what we previously mentioned, the Librarian is the only one that can leave the Library, excluding Guests, they can enter temporarily before being kicked out.
The Entrance has no visible door and the actual door can only be summoned by the Librarian.
Wanna work as an Assistant Librarian? Pack your stuff cause you never leaving till you become a Master Librarian.

Time also works differently here, one hour in the outside world is equal to a year in the Library.
Naturally time gors normal when the entrance door is opened, to avoid time problems.

So what I'm hearing is, Casa Madrigal on steroids

Wuh. Oh that aspect, yeah kind of, but not really, it just hears what you want and shifts accordingly. It helps you find the books you want.

Other than that i thought it was similar to the Librarians series

Idk if I said this before but, the world-building is good enough. It’s wild that the second floor is jam-packed with books while the others have a fair to no amount of books.

They have books, every floor has books, just that the second is PACKED

Yup

Honest favourite is entrance

:P DESPERATELY needs to read some books about subspace time.

Cool