Need Help with Loot - Massive Hidden Library

Hello All!

First time using the new platform - F*ck Spez

I am building an utterly MASSIVE dungeon that is based on the idea of a hidden library. Its ancient, full of lost secrets and treasure. It shifts and moves and its easy to get lost.

I'm trying to populate sections with relevant loot for my party. I have RNG tables, but I prefer not to use them, as I like having narrative reasons for why something is there. (For instance, you find a dead adventurer, and in their pack is healing potions and a magic item).

There is a section of the library that is completely underwater. Its for housing the literature of underwater civilizations - "books" that would dry out and be lost if they ever left the water.

What sort of magic items would be found in this section? Bonus points if its book-themed. (I've already got the obvious ones that give you water breathing or swim speed, help me be more creative)

THANKS!