Vhelnish

From MTG Salvation Wiki

Vhelnish was an underground kingdom of undead ruled by the Lich Lord Dralnu. According to Dralnu, the city had previously been the palace of the lich lady that reanimated him, which she just used to display her collection of undead. After he slew her, Dralnu transformed it into an actual city, giving his minions a sense of purpose. It is unknown exactly when and how the kingdom came into being, but it was likely ruled by Dralnu for centuries. The underground palace has not been seen since the lich lord's death.