How do i level up library or key pages? so many questions..

[Kalasgurka]

Im stuck in progress and having a real hard time and the Manual isnt helping.
1 How do i level up my library?
2 I cannot edit key pages? add passives etc, its greyed out?

[Araders]

1. You must defeat all the anomalies available on the floors.
2. This feature opens closer to the middle of the game.

[bugsandy]

If it's too hard and you can't add passive/cant unlock more anomalies pages yet then try modifying the page every time you progress. I found out (the hard way) that the early-mid game has a significant power gap of combat pages between each reception. And maybe before going into the battle, take a glance at the enemy resistant/passive and combat pages then adjust accordingly before going in. One last thing, don't forget to keep your eyes buttered till the end!

[Starakira]

I just want to mention, if you're looking at a guide that says you can level up Keypages, that guide is severely outdated since leveling keypages was a feature that was removed a long time ago to reduce the grind.

[Flygoniaks]

For leveling up the Library, check each floor on the main screen for their assignments. The assignments on the Floor of General Works are almost exclusively related to story progress, while others usually require you to get specific books (if it says "Obtain the Book of [???]" that means it's from a reception you haven't beaten yet). Once you've completed those floor assignments, you can do the Abnormality Battle to level up that floor. The Library's level is the cumulative level of all your floors (ex: Level 2 History + Level 2 General Works = Level 4).

Passive transfer isn't unlocked until Chapter 4, so I wouldn't worry about that. Just pick a Key Page and select Combat Pages based on the passive ability it already has (assuming you've done more than just the Rats, you should have some usable Key Pages by now).

A handy way to do this is by marking one of each Key Page you want to use as a favorite (to keep track of them), and occasionally update the its deck as you unlock more Combat Pages.

This will be how you build your decks for a while, allowing you to get used to the system before things get more complex. I'd say that most Key Pages are viable in the early game as long as they have a unique passive ability you can take advantage of, so get creative!