Clearly it contains alchemists' lost secrets to creating slimes. But is cursed to gradually turn anyone who reads it into a slime. Which at least one player will obviously try to do. There's some good motivation to complete the quest and/or make one or more players play as an intelligent slime for a while.
[EDIT] Gelatinous cubes, rather. Now I must read the Book of Shame.
Watabou is my go-to for low-prep toolbox apps in gaming. Between that one, and donjon (https://donjon.bin.sh/), and a name generator like https://www.fantasynamegenerators.com/ , it's basically everything you need for a quick jaunt into the dark with your buddies.
When you click into the map and press ctrl+r it just creates a new map and doesn't refresh the page. Thought that was pretty nice but others might not like hijacking ctrl+r
You reload until you get one that looks cool, then you screen grab it, and hook up with some friends and your favorite RPG system rules. D&D, Hackmaster, GURPS, Thirsty Sword Lesbians, Pathfinder, Encounter Critical, whatever.
If you are lacking in rulebooks and/or friends this is pretty much useless.
Only post singularity. Much of the appeal of roleplaying games is being able to do stuff that you can't do in video games. But a sibling comment did link to a tool that would let you play these maps with your friends by importing them into a virtual tabletop.
Behold! The legendary Book of Shame!