Legionnaire, Tasmia Mallor, aka Shadow Lass, stands heroically in a dark alley.

Tasmia Mallor originates from the planet Talok VIII, and possesses darkness-manipulating abilities, which she and her cousin Grev (Shadow Kid) receive from their ancestors' spirits. As her ancestors before her from the past thousand years, Tasmia is the hereditary shadow champion of Talok VIII. Shadow Lass joins the Legion after her homeworld is invaded by the Fatal Five. She helps the Legion to defeat them. After joining, she became romantically involved with Lar Gand (Mon-El) and eventually marries him. Their marriage is rocky for years despite their strong feelings for each other, and Tasmia goes into mourning when Gand dies.