The blue mythic beast, unleashing all its divinity, is one of the future possibilities of "Fenrir", the beast who hungers for the realms of deities insatiably. Fenrir doesn't know that "Vanargandr" is in fact himself, and Vanargandr doesn't tell Fenrir the truth. Fenrir uses Vanargandr merely as a power to wreak havoc, and Vanargandr treats Fenrir as nothing more than a tool, a tool to prepare stages for devastation. The two beasts, linked by neither trust nor empathy but "wishes of destruction", irregularly encountered each other by "Stride".
Their fangs and claws are bared to destroy everything within their sights. To fulfill the fate of those born with the divinity of destruction, the blue beasts roam the land to seek new prey.