Curare

A member of the Society of Assassins, who wields a laser-sharpened scimitar that can cut through any material and never speaks. Her true identity was never revealed and Batman had once glimpsed her feature when her veil fell during a fight. He was visibly shocked and thus implied that she is terribly disfigured. After Batman foils her attempt to assassinate Gotham's District Attorney, she ends up becoming a target of the Society herself, resulting in Curaré ultimately killing every member of the Society of Assassins before seeking revenge against Batman.