“All life must end,, - The Lich king

The Scourge is one of three major undead factions existing in the world of Azeroth (the other two being the Forsaken and the Knights of the Ebon Blade). Until recently, it was a major player for control of the world. Created initially as the precursor to an invasion by the Burning Legion, the Scourge broke free from their demonic masters and — under the iron rule of the dread Lich King — have built up their power base on the arctic continent of Northrend. Their influence spreads throughout Northrend, as well as the Plaguelands in northern Lordaeron and southern Quel'Thalas, and even Kalimdor to a small degree. Consisting of thousands of walking corpses, disembodied spirits, foul beasts of the north, and damned mortal men,the Scourge is a terrifying and insidious enemy which, before its downfall, was perhaps the most dangerous threat to the world of Azeroth.