Lucius is encountered on the journey toward the demon lord. She initially appears as a suit of armor moving independently. The armor's sentient, mobile nature sparks conflict. During an encounter, Lucius acts in a way that results in others losing clothing. This incident reveals Lucius is female. The situation is practically resolved by those involved without exploitation. Following these events, Lucius joins the group's quest. She becomes a permanent member of the traveling party, accompanying the main group on their ongoing mission.