As the Queen of the undead Forsaken, Sylvanas Windrunner seeks a higher purpose for a people who have already died once.
Sylvanas was once the ranger-general of Silvermoon, a commander charged with defending the elven kingdom of Quel'Thalas. She perished during the Third War, when her homeland was ravaged by Arthas Menethil and the undead Scourge, but her death was not the end. Cruelly, Arthas ripped her soul from her body, subjugating her as a banshee, a hate-filled agent of the Scourge. When the Lich King was weakened by an assault from Illidan Stormrage, Sylvanas and other willful undead broke free from his control and built a new home beneath the fallen kingdom of Lordaeron. They called themselves the Forsaken, and vowed to exterminate the Lich King at all costs.
After fighting for their right to join the Horde, Sylvanas led her "people" to the continent of Northrend to destroy the Lich King. Before they could succeed, an uprising among the Forsaken killed members of the Horde and Alliance, casting a shadow of mistrust over Sylvanas. She came to dwell on the Forsaken's dim prospects for the future; they were despised and unable to procreate. Ultimately, the Banshee Queen made a pact with the Val'kyr, nightmarish creatures capable of creating more undead, to give the Forsaken a chance to persist on Azeroth.