La Croix

A talented monster that was the most skilled practitioner of the Artiste family techniques. Great things were expected of her, especially in the field of necromancy.

Spoiler

But in an accident, she turned herself into a zombie after being critically injured protecting her sister.

After that, her necromantic research intensified, even going so far as to assassinate famous monsters. Due to her egregious actions, the Monster Lord banished her. On the run, she was eventually recruited by Promestein who was impressed by La Croix's knowledge of biology, surpassing even her own.

Spoiler

A great deal of energy is needed to maintain her undead form, requiring many men be sacrificed for their semen. As her life grew on, her research turned into an obsession with reclaiming a true, living flesh and blood body.