Hræsvelgr Sakiyo formerly bore the Hræsvelgr divine tattoo, granting him heightened defensive abilities during his tenure as an active Scard. He fought in the pivotal Akatsuki Rebellion alongside Azusa and Morrigan Sakiyo, opposing corporate dominance to secure independence for the Akatsuki Special Zone.

Approximately three years before the series' primary timeline, he relinquished his tattoo and abandoned combat. Transitioning to civilian life, he assumed leadership of an orphanage within the Akatsuki Special Zone. This institution raised key figures Ran Washimine and Jin Karasue prior to their recruitment by Artemis.

Presently, Hræsvelgr operates an expansive information network across the zone, utilizing his experience and connections to offer indirect support. His role emphasizes guidance and sanctuary provision, deliberately avoiding direct engagement in conflicts among the territory's three major factions.