Marie Carpard von Einzbern is a central character in the visual novel and anime series 'Dies Irae.' She is a mysterious, ethereal girl who becomes the spiritual companion and key figure in the protagonist Ren Fujii's journey. Marie possesses immense supernatural power, being the inheritor of the guillotine's curse and embodying the concept of 'Mercy.' Within the story, she plays a crucial role in the struggle against the Longinus Dreizehn Orden, serving both as Ren's source of strength and as a pivotal force in the unfolding conflict.