Arishia

She was one of 13 heroes ordered by the king to deal with the Moon Demon King, Clevatess. However, her comrades were all killed. Clevatess then destroyed the city, massacring everyone. Arishya adopted a baby to study humanity, and Clevatess gave Arishya some demon blood to resurrect her. She then became Clevatess's slave. However, Clevatess wasn't entirely cruel. Arishya, though a bit stubborn and not very polite, was more of a companion than a slave, constantly offering advice about humans.