Tower of Druids is a comic-book written by Kenny Centazzo. It's a comic-book but is classified as a "Graphic-Novel", likely due to its storyline. Greg appears to be a fan of this book. It only appears in Cabin Fever, when Greg says it's worth 40 dollars since he got the first edition signed by Kenny Centazzo. However, he finds out it's worthless when he realizes Susan forged the signature due to her low tolerance of waiting in line. It does get signed at the end of the book, but Kenny writes the name as "Craig," so Greg hopes he'll find a person with that name and sell it to him for lots of money.