The term "Land of Elyon" is likely referring to the popular Korean MMORPG Elyon, which doesn't have a corresponding book series.
It's possible you're thinking of a different series or a fan-created story. Could you provide more information about the book you're looking for?
For example, you could mention:
* The author's name
* Any other details about the book's title or cover
* The genre of the book (fantasy, science fiction, etc.)
With more details, I might be able to help you find the book you're looking for.