The Blight Tower.

[Archeron the Witch Lord]

Deep within the woods on the continent of Vieera lies the ancient ruins of Dalaran where once mages from all over A'dense went to study. Their ruler, Archeron the Necrosage was wise and powerful, but one fateful day he made a horrible mistake. Under the guidance of Kora, Archeron was convinced to wage war on the world. He took forbidden magical tomes known as the Megathericons and used them to create the ultimate dark item. A Blighted Crystal of Evershadow. This cursed weapon of mass destruction, forged from magical everlasting ice, had only been created twice before in the history of A'dense with drastic consequences. When the crystal was completed, Archeron and his twelve Warlock Knights made a blood pact in order to summon the demon Albion into the crystal to grant it ultimate power. A miscalculation in the spell allowed Albion to break free of his bindings and shatter the crystal into several pieces (though a large portion remained intact). Albion, in his anger, cursed the land and it's people. Stripping them of their bodies and binding their souls to the earth. The spirits, maddened from their confinement, tore Dalaran apart. The Thirteen were saved from the fate of their people by the blood pact they made. Rather than becoming maddened ghosts, they were stripped of their mortality, and placed into cursed bodies. Though they were still as powerful as ever, they became disconnected from the world and became shades.

800 years after that day, the Shades of Vieera are slowly gaining power. The Blighted Crystal of Everlasting Ice is slowly regaining it's pieces, and soon Archeron may yet conquer the world, transforming the living breathing denizens of A'Dense into maddened ghosts and covering the world in shadow for all eternity..