(W) Martin Olson. Dive deeper into the secrets of the Land of Ooo with this mysterious mash-up of The Enchiridion (the ancient hero's handbook, as featured on the series) with Marceline's private scrapbook. All-new, gorgeous, hilarious, and grotesque illustration? Ancient wizard lore, spells, curses, and jokes? Scribbles from and souvenirs of a cute girl demon growing up? Annotations by Finn, Jake, Marceline, and Simion Petrikov (the Ice King)? Check, check, check, check please! From the same creative team behind the bestselling Adventure Time Encyclopedia, this in-world compendium of all things Oooian is a humor-, paradox-, and literary contrivance-filled tome true to the imagination, innovation, and heart of Adventure Time!.