Her real name is Tasmia Mallor and her homeworld is Talok VIII. She has the power to project darkness. Like all Talokians, she has blue skin and pointed ears. She and her cousin Grev (Shadow Kid) received their powers from their ancestors, whose spirits reside in a cave on Talok VIII (Talokians practice ancestor worship). As her ancestors before her from the past thousand years, Tasmia is the hereditary shadow champion of Talok VIII. Her 20th century ancestors, Lydea Mallor and Lyrissa Mallor, were also shadow champions and members of the interstellar police force L.E.G.I.O.N.
Her cousin Grev, who also wielded the shadow power thanks to his bloodline, went on to join the Legion Academy as Shadow Kid, though aware that he could never join the team whilst she was an active member (Due to the LSH rules regarding duplication of powers), he hoped to be better prepared to protect Talok in Tasmia's absence.
Shadow Lass joined the Legion after her homeworld was invaded by the Fatal Five. She helped the Legion to defeat them. After joining, she became romantically involved with Lar Gand and eventually married him after he was mortally wounded fighting the Time Trapper as part of the conspiracy to avenge Superboy's death at the Trapper's hands. Their marriage was rocky for many years despite their strong feelings for each other, and Tasmia went into mourning when Gand died. The mourning was temporary, as he returned to her, inhabited briefly by the Time Trapper's essence, until a cataclysmic battle erased the Trapper from existence and completely rewrote reality.
1994 Reboot
In 1994, after the Zero Hour event, the Legion of Superheroes continuity was restarted. In this storyline, Shadow Lass used the codename Umbra and exhibited a much more aggressive and businesslike attitude. While Umbra never became involved with the Post-ZH reimagining of Lar Gand, she did make several attempts to garner his attention, only to be rebuffed.
Empowerment
Tasmia Mallor was the latest in a long line of Shadow Champions of Talok VIII. At birth she was taken from her mother, the then-current Champion, in a bid to ensure that no single accident or attack could ever claim both of them, and saw her only seven times during her lifetime, all at solemn ceremonies in which they were forbidden to speak. As she grew up, she was raised by priests and was trained in combat and drilled in the order of her bloodline. She loved it.
Finally, one day, her mother was killed in battle and she was brought before the leaders of Talok VIII's twelve tribes - the only time they would ever congregate peacefully - before entering the Shadow Cave, where she met the spirits of her mother and the other prior Champions. After they chastised her for never wondering how her mother died, she took to heart their counsel to protect Talok VIII (but not their warning against egocentrism) and they told her to Go In Power.
On leaving the cave, she found the inhabitants of Talok VIII on their knees, waiting for a sign - which she provided when she let the Shadows loose. After that, she became the Champion, using her position to give orders to leaders and priests, all in maintenance of the Old Ways. This lasted until the ship came.
The United Planets ship came in peace, prosyletizing the benefits of U.P. membership. Sent to greet the "invaders," she understood none of it , and she set about dismantling the "hideous" ship and crew. Despite their best efforts, she caused an explosion that caused the ship's landing gear to collapse. After that, the priests (who had already been harboring doubts about the "zealot") kept her drugged until UP entry negotiations were complete. Profoundly disturbed by the cultural influx and Talok's "captitulance", she was eventually "dismissed", and told to study the galaxy to "open her mind."
Legion
She eventually made her way to Earth, and entered the Legion tryouts and was accepted as Umbra, although her curt attitude irritated Sensor.
As part of the Legion, she fought Mordru, and later played a key part in saving Wildfire - despite, after her initial fierce compassion, being disgusted at the thought of the forcible integration of his two original souls.
Blighted
Far later, the Blight enslaved most of Earth, including all but a few of the Legionnaires. Umbra was not among these escapees. When she was freed, she began to have a mental breakdown, prompted not only by the fact of her enslavement and what she'd been forced to do, but by the fact that the Blight's touching of her mind had meant that she'd enjoyed it. Shortly thereafter, she became one of the Legionnaires lost through a space rift and catapulted into another galaxy.
There, she became harder and colder than ever in lieu of breaking down completely and showing the fear that now guided her, while the voices of her ancestors from the shadow became faint and hard to understand. Then Saturn Girl tried to telepathically calm her, and it all went wrong - a telepathic matrix over a whole planet interfered with her powers, and the result left Saturn Girl in a coma, a shadow-creature fueled by Umbra and Saturn Girl's combined pain and fear loose on the ship - and an Umbra completely without pain or anxiety, leaving only anger and arrogant self-confidence.
She went down to the planet, where she began to fight Singularity (a Superman-like being), for whom the telepathic illusion which had caused the trouble was being maintained (to keep him from causing trouble on his race's real planet). When Ultra Boy and Monstress went down to get her, she began to fight them too. Finally, she was knocked out by Singularity while the Legion, having captured the shadow-creature and realized what it was, knocked out the illusion causing Singularity to go looking for his original planet. Then Brainiac 5 managed to restore Umbra and Saturn Girl's minds, and Umbra finally broke down in a crying heap.
Recovery
After this she finally began to heal from everything that had happened to her - until, after they managed to return to UP space, her power mysteriously cut out. To find out what had happened, she finally returned to Talok VIII for the first time since her dismissal. There she found a planet completely cloaked in shadow, and a shadow which knocked her out. Shadow Maven, one of the priests who had trained her, found her and told her that after her loss in the rift, they had believed her dead and managed to empower her "distant cousin Grev" with the shadows through the use of technology, and had him cloak the planet completely, withdrawing from the United Planets.
Angry at the thought that just as she had accepted the galaxy Talok had turned away from it, she went to confront Grev. The shadow gradually leeched back to her, until she split open the suit Grev used to control the shadow - and found a withered corpse inside, as he had been unable to withstand being a conduit for the Shadow, while the suit ran on its last programmed directives. She cast the shadow-cloak from the planet, and spent some time there before returning to the Legion.
Powers and abilities
Umbra can cast darkfields preventing all light from reaching an area from outside. These can either be complete, effectively rendering useless all light sources within the area, or hollow to allow the interior to be lit. She can also solidify these fields, to use as a more direct weapon.
She is also an expert hand-to-hand combatant, and can see in complete darkness (both her own and otherwise).
2005 Reboot
In 2005, the Legion continuity was again restarted. Shadow Lass has appeared in this reimagining, however little has been revealed about this version of the character. She is portrayed as a very aggressive warrior. At one point, she was in a relationship with Karate Kid, but they had broken up by the time the series started. She is currently dating Ultra Boy.
When the Legion visited Talok VII, they were surprised at the degree of favour Shadow Lass commanded, including a large banquet in her honour. Tasmia explained that if the Shadow Champion did not accept such gifts, people would see her as aloof. Nonetheless, this inspired Atom Girl to suggest Shadow Lass run for Legion leader on a hedonism platform.
Tasmia also has a friendly rivalry with Grev, who in this continuity is her brother, rather than cousin.
Post-Infinite Crisis
The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis Legion to continuity, as seen in "The Lightning Saga" story arc in Justice League of America and Justice Society of America, and in the "Superman and the Legion of Super-Heroes" story arc in Action Comics. Shadow Lass is included in their number, and is among the group of Legionnaires who help Superman defeat the villainous Justice League of Earth in the "Action Comics" storyline.
During the Justice League of Earth's xenophobic reign, Night Girl and Shadow Lass worked with Timber Wolf and Lightning Lass to help thousands of extraterrestrials escape Eath to their home planets via an "underground" interstellar portal zone. Shady also debuts a reworked version of her classic Grell-era bikini in the Action Comics arc, and uses her shadow-casting powers in tandem with Night Girl's only-in-darkness super strength.
Shadow Lass is shown prominently in the teaser image for the "Final Crisis: Legion of Three Worlds" mini-series, using her powers to keep Mordru and Saturn Queen in the dark.[1]
Mon-El has not yet been shown in this continuity, except in flashback, but a statue of him is among those shown to be in Superman's Fortress of Solitude in "The Lightning Saga" story arc. Whether he and Shady will reunite in the forthcoming "Final Crisis: Legion of Three Worlds" mini-series remains to be seen.