What does ezio do to the recites finger?

In "Assassin's Creed II," Ezio Auditore removes the ring finger of the deceased Pope Rodrigo Borgia, a symbolic act meant to sever his connection to the Assassin's Creed. This act is a form of revenge and a way to reclaim the Apple of Eden, which the Pope sought to control. The severed finger is then used to unlock the secrets of the Apple, emphasizing the ongoing conflict between the Assassins and the Templars.