5. The Enchiridion! -

The book's legacy extends to the video game Adventure Time: Pirates of the Enchiridion , where the Land of Ooo has been flooded, and Finn and Jake must use their heroic skills to save the waterlogged world.

: The book was eventually turned to stone and destroyed by Finn to prevent the Lich from accessing the multiverse. Ironically, this act of destruction actually created the portal the Lich sought. 5. The Enchiridion!

While initially presented as a simple hero's guide, the Enchiridion becomes central to the series' deep lore: The book's legacy extends to the video game

: Finn is instructed to slay a beast described as "completely evil." While he initially expresses willingness to slay anything evil, he ultimately succeeds by sticking to his righteous principles. While initially presented as a simple hero's guide,

The is the fifth episode of the first season of Adventure Time , originally aired on April 19, 2010. This pivotal episode follows Finn the Human and Jake the Dog on a quest to retrieve the legendary hero's handbook, The Enchiridion , from the top of Mount Cragdor. Episode Summary & Key Events

: To obtain the book, Finn must pass several moral and physical tests set by the Guardian of the Enchiridion.