Musabori

Musabori (むさぼり, Japanese for Devouring) is one of the seven Kyūtai forged by an unnamed Kidō master centuries ago. Its current holder and protector is Garian Shinjo.

Powers
Hardened Skin: By manipulating and hardening the owners spiritual energy, the orb becomes a liquid which suffuses the wearers body in a metallic sheen that makes them all but immune to bladed weapons, either or. Only abilities which specifically ignore defenses or imbue the strike with a tremendous degree of cutting power can hope to slice through it.

Immortality: The owner becomes immune to the ravages of time upon their body, making them un-aging from when they acquired the orb. This ability is shared among all the Kyūtai.

Behind the Scenes
This is influenced greatly by the seven Ka'kari in the Night Angel Trilogy of novels.