Sextum "Averruncus of Water"

Sextum is the Averruncus of Water and is the only female of the Averruncus series. She is shown to have more respect for Dynamis than Tertium does. Like her companions, her name is derived from numbers, and in this case from the latin word for "sixth", as she is the sixth generation Averruncus. (Source: Negima Wiki)