The Great Book is a book full of alchemy written by the High priests of Castle Dunwyn. According to legend, it contains a dangerous secret because of the priests being mentored by mystical creatures with untold powers. The Last Page of the Great Book was acquired by Black Heron in the DuckTales (2017) episode From the Confidential Casefiles of Agent 22! to create an army of bouncing soldiers but was stopped by the combined effort of Scrooge and Agent 22. The last page was destroyed in the process.