Kalaria the Soul Taker

Kalaria the Soul Taker (died c. 420s BCE) was a mercenary who operated in Greece during the Peloponnesian War.  

After her parents died she was raised by her uncle and over time she learned to endure pain and became a well-known misthios.  She believed that taking her victims' souls would comfort her broken one, thus earning the title "the Soul Taker."