Abandoned on the doorstep of the Falis church as a baby, Flaus was brought up in the monastery and raised to become a priestess. Though she showed little ability for magic, she took an interest in combat and became a skilled fighter at a young age. After the release of the demons from the Labyrinth, Flaus began slaying demons in nearby villages throughout Valis, which led to her meeting Beld and Wort, whom she agreed to hire as mercenaries.