Arnys wields the Nebestigma, a cursed weapon, defining her role. She maintains ties to the Shoshidai organization or its former members, demonstrated by her visit to Issei Ariga following his departure from the group. This interaction engages her directly with the narrative's conflicts and alliances emerging from Shoshidai's activities. Her presence intersects with characters grappling with the transformations and consequences of using demonic weapons.