Sylvanas is the actual leader and queen of the forsaken. Their base is located at the underground tirisfal castle called Undercity. At burning crusade era Drumans, Farner and Ledgend found her amulet which caused her to sang the Lament Of Highborne theme. Awaken of her true objective she sent all forsaken to Northrend in order to destroy the scourge and it's current leader known as Lich King. Sylvanas fought with Lich King at Icecrown however, Sylvanas couldn't stand a chance agaisnt him. After defeating lich king later, Sylvanas disappeared, probably returning to Undercity or find a way to discover the connection to reach Burning Legion Headquarters, or even exploring the entire azeroth as Drumans did.