Kyrisa was a Human Nightsister witch from the planet Dathomir. Banished by her clan following a fierce battle for leadership.
Born on the planet Dathomir, Kyrisa was a member of the Nightsisters clan of the Dathomiri Witches. Under the leadership of clan mother Gethzerion, she developed exceptional skill in controlling the minds of the local beasts, such as the enormous Dathomiri rancors. Gethzerion saw promise in Kyrisa. When Dark Jedi Namman Cha, servant to the Emperor Palpatine was on a mission on Dathomir, he had sensed that Kyrisa and her ability were special, and determined that she could become a powerful ally to the Emperor.
Over time, Kyrisa became convinced that Gethzerion was too weak to lead the Nightsisters, and that under Kyrisa's control, the clan would be able to rule Dathomir. When she went to confront Gethzerion, Kyrisa openly declared her intentions to Gethzerion. However, in their duel Gethzerion had beat Kyrisa, exiling her from the Nightsisters and sending her offworld in a small starship, fearing that she was becoming too dangerous. Her ship would crash on the remote Outer Rim planet Hoth.
Despite Hoth's hostile frozen climate, Kyrisa was able to survive by using local beast to gain the necessary knowledge of the planet. Away from her home planet and her clan, she relied on a wampa with which she made a connection with for emotional and physical warmth. Enraged at her banishment, Kyrisa vowed revenge against Clan Mother Gethzerion and the Nightsisters. Soon, she extended her mind control over entire packs of wampas and other local creatures such as Hoth hogs. Kyrisa found that Hoth could be a planet on which she could fully dominate. Experiencing a rebirth, she came to treat the cold planet as her new home. Eventually the entirety of the wildlife in the area Kyrisa resided in came under her command. She even experimented in the genetic engineering to create unnatural overgrown beasts of gargantuan proportions, such as the over-sized Hoth hog Maraki or the giant wampa named Unkajo.
However, Kyrisa's departure from Dathomir would not go unnoticed by other forces of the galactic scale: Namman Cha still intended to recruit the Nightsister into the service of the Emperor. He learned that her starship had crashed on Hoth and set out on the mission to find her. The Imperial Security Bureau leader Blackhole also was interested in the Nightsister, having several ideas for the use of beast mastery in the espionage, he set a small detachment of ISB agents led by captain Jeffren Brek to aid Cha in his search. Cha's involvement had also became known to his old enemy Rachi Sitra, a Jedi Knight aiding the Rebel Alliance. Sitra learned from the Dathomiri Witches from the Singing Mountain Clan of the danger Kyrisa represented and, determined not to let her be found by the Empire, traveled to Hoth with a mission to find her first.
Around the same time, the Alliance to Restore the Republic had discovered the distant planet Hoth and established a small outpost there, evaluating the potential of building a larger base. Kyrisa began using her pack of minions to wreak havoc on the Alliance forces, stealing supplies necessary to help her return home to enact her revenge. At the same time the multiple parties looking for the Nightsister on the planet began encountering resistance from Kyrisa's beasts. A single Rebel looking for shelter in an ice-storm stumbled onto a cavern full of her Hoth hogs and was forced to defend himself, killing all of the beasts, including Kyrisa's beloved Maraki. Sensing his death, Kyrisa rushed to the cave, accompanied by two Wampas, and confronted the Rebel who was about to leave. She ignored his words that he was forced to defend himself and blamed him of murdering her "children." She ordered her menagerie to attack, but the well-armed Rebel managed to slay most of the beasts. Seeing the battle turned against her, Kyrisa jumped on the back of a hog to make an escape.
Enraged by the loss of one of her pets, Kyrisa soon found another one of her creations, the giant wampa Unkajo slain by a squad of Imperial soldiers. Furious, she directed her pets at the Imperials she saw as murderers. However, the trained soldiers managed to hold the beast off and one even managed to get to Kyrisa and knock her down. She got herself up with the Force to see that many more of her pets have been slain, and the battle was going against her. The remaining creatures formed a line to cover her retreat and the Nightsister had escaped into the blowing snow. However, the Dark Jedi Namman Cha eventually managed to track her down by following her beasts and, after a fierce lightsaber clash, was able to persuade her to join him.
Kyrisa was a skilled Nightsister and had fully mastered the power of Animal friendship. While initially she, just like other Dathomiri Witches, only established a bond with her rancor, eventually she could exert and maintain her influence over multiple creatures simultaneously. The creatures remained constantly over her control, even at significant distance, and obeyed her commands, both spoken and mental. Her ability attracted attention of both Gethzerion and Namman Cha, who saw Kyrisa as a powerful ally, and Augwynne Djo and Rachi Sitra, who saw her as a great danger. While on Hoth, Kyrisa had employed not only the animal friendship, but her skill in the genetic engineering as well, by creating creatures far larger compared to their natural size. She also was one of the many Nightsisters who, in spite of their tribe's rather primitive homeland, wielded a lightsaber.
Kyrisa was created by the developer team of the Star Wars Galaxies Trading Card Game as the pivotal story element of The Nightsister's Revenge, the sixth of the game's expansions. She confronts the player in the both light side and the dark side campaign scenarios, while her story is told through various cards within the set. She was later added to the MMORPG Star Wars Galaxies in December 2010, as part of the game's "Game Update 19".