From the introduction: ”This is a Jump-Start Kit for Ars Magica™. In its original form it was the first Jump-Start kit; we made 100 copies and sold them all at the 1988 GEN CON/Origins® convention. Since we had so much fun writing and selling that special supplement (exclusive to the convention), we decided to do it again. Besides doing something completely new, the Stormrider™ Jump-Start Kit, we decided to continue the tradition of an inexpensive, limited-edition kit for the conventions. The basic adventure in this revision of The Bats of Mercille is the same as last year, but it has been edited and expanded, and updated to conform to the second edition of Ars Magica.”