Shadow Lass is a native of Talok VIII, whose inhabitants are humanoid with blue skin and black hair.

Shadow Lass's real name is Tasmia Mallor. She and her cousin Grev were exposed to a catalytic gas when they went into a sacred cave as youngsters. Their exposure to the gas awakened their shadow powers, enabling them to project a field of darkness that absorbs light. She joined the Legion of Super-heroes after aiding them in freeing her planet from the Fatal Five.

She is romantically involved with Mon-El.

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