Caelivorite

Caelivorite is a mysterious, ultra-dense celestial metal that forms only in the cataclysmic aftermath of a fallen sky guardian like Valkoros, the Cloudpiercer. When a creature of pure aether crashes from the heights of the Sky Pillar and shatters upon the world, fragments of its divine core are drawn into the deepest trenches of the world — where sky meets abyss.