Books
For the first time in an event, you will now collect multiple short questlines (books) as rewards within the tile mini-game (these are in addition to the conventional questline), and at the end of each questline, a special reward should be granted to you. This also means that you'll be able to potentially work on multiple quests simultaneously.
These Storybooks can be found while advancing through the lost library, and whenever you collect one of them, it will be available to activate in your library, which can be accessed in the main event window. You can activate simultaneously as many questlines you want, as long as they're not the same! When you finish one, a check-mark is shown next to that book. You can find and collect more than one of each book, and their chance of appearance may vary depending on their rareness (there are regular, silver and golden books).
