As per its title, it contains an array of torture methods.
The front page is green and depicts an iron maiden on the front.
It depicts a dragon on the front.
Role in series
Squidward and SpongeBob use this book to torture Mr. Krabs because they think he is a robot. They torture him by tying him up in a chair and asking him questions. Every time he refuses to answer a question, he is slapped. After this does not work, they use a psychological torture method by destroying all of his favorite possessions in front of him while he is still tied up.
Princess Mindy decides to let the dungeon torturer borrow this book so that she could have the crown polisher polish her mirror.