Dummy Soul
From Little Tail Wiki
A dummy soul is a gameplay and story element featured throughout the Fuga series. It was first introduced as a bonus feature in the first title's deluxe edition.
Properties
Dummy souls are portrayed as discs containing data that emulates a living being. They are used to fool the Taranis' and Exo-Taranis' Soul Cannon into firing without performing a proper sacrifice. A dummy soul is also capable of reversing an already complete sacrifice under strange circumstances. Where dummy souls come from and how they're manufactured remains vague.