Illustrator David White released the unpublished book's illustrations on his blog. 
The book is supposedly centered around the final battle between the Humans and the Robots, explaining what happened during the battle between the humans and the robots during the battle with the Mobile Devastator, nothing else is known about the book.
|Original Books:||Book 1: Escape from Sentai Mountain | Book 2: Attack of the Robots | Book 3: Search for the Golden City | Book 4: Ghost of the Past | Book 5: Race to the Golden City ||
|Never Released:||Book 6: Golden Doom | Book 7: Jungle of Danger ||
|Joev14 Fanfics:||Book 1: The Gorge | Book 2: Golden City Origins | Book 3: Peace Origins | Book 4: Shades of Doom ||
|Other Books:||Exo-Force Sticker Book | Exo-Force Activity Book | Secret of the Golden Tower | Collector's Guide ||