An Immortal Shield is the first Sin protective device that was developed. It was created by Darren Orakha in the Great Library of Thalira.
The Immortal Shield is a device able to amplify ten-fold the protective ability of an Immortal One, making even a single one of them able to protect an entire city..
The device is a two meters tall and one meter wide cilinder, constructed using glass, silver, copper and Fumonium. It’s transparent from outside but opaque from inside. To function an immortal one must be present inside it at all times. Subsequent versions of the Immortal Shield also icluded ways to trap the Immortal One places inside.