Template:Item/Series The Mystery Of Skeletech Series is a pair of book items. These items can be found with the 'unique' tag at Science HQ in World's End. However, it can also be found without the 'unique' label in The Great Library in Black Scratch.
The books contain theories into the destruction of the former empires. The first book was written by the current leader of the Machinists, Finch and the second was written by Idad.
The first possible scenario that he theorized about Skeletons having a safe place of incubation is later noted that people have not yet discovered any supporting evidence for this scenario in Mass Extinction I written by Finch. The results from their plan to carry out deeper excavation around central plains can be found in Mass Extinction III written by Atticus. ru:Серия книг "Загадка скелетехнологии"