Her dark past of being hated by all humans also caused her to join forces with the Dark Lord to throw the world into the age of chaos and darkness.
Not much was well-known about Zealotus's past but it was revealed that she was a daughter of her human mother and a monster father. Before her birth, her mother was a widow who lived alone in a village somewhere in Rune-Midgard.
Due to her past, Zealotus was known for hating humans for some reasons. She also loved to enjoy humans' sufferings