The Klingon Miral was the daughter of L'Naan and mother of B'Elanna Torres and former wife of John Torres. Miral and John separated when B'Elanna was about five. The break-up was due to Miral's strict Klingon beliefs, which also caused a rift between her and B'Elanna. B'Elanna blamed her mother for the broken marriage and never forgave her for it. The last time she contacted her mother, she was living on Qo'noS. (VOY: "Lineage", "Eye of the Needle")
When B'Elanna lapsed into a coma after her shuttle was hit by an ion storm in 2376, she found herself on the Barge of the Dead on her way to Gre'thor (the Klingon version of Hell). During the trip another dishonored soul appeared to her: her mother, Miral, who, according to Klingon religious beliefs, had to pay for the sins of her daughter. When B'Elanna awoke, she was determined to save her mother. She convinced Kathryn Janeway to let the The Doctor put her back into a near death coma.
B'Elanna arrived again on the Barge and tried to perform a ritual that would send Miral to Sto-vo-kor. It failed and B'Elanna realized that the only way to save Miral was to die for her and take her place in Gre'thor. She did this and Miral ascended to Sto-Vo-Kor, as B'Elanna was led into Gre'thor.
Miral then appeared to B'Elanna again, telling her that she could be saved if B'Elanna lived with honor. Just then, The Doctor woke B'Elanna from her coma. Before being revived, Miral told B'Elanna that she may see her when she joined Sto-Vo-Kor herself, or when she returned home to the Alpha Quadrant. (VOY: "Barge of the Dead")