From the module introduction:
"Many centuries ago, a very unusual Mechanician appeared in the world of Cidri. His name is lost to time; he is known as the Tinker. He built clockwork automatons the like of which has not been approached by anyone since. But these are no ordinary toys built for the amusement of the rich. They are capable of independent action, and never run down or need winding. Indeed, their power source is among their greatest mysteries. It is assumed to be magical, but they have no aura of magic. Some resemble animals, while others look like no creature known to man. They seem to have no purpose other than self-perpetuation."
This PDF adventure is the fourth in a series of five initial adventures created for The Fantasy Trip: Legacy Edition. It was made available in February 2019 to backers of The Fantasy Trip Adventures Kickstarter, a hardcover collection of adventures due to be published in August 2019.