Forty years after the Oblivion crisis, the empire of Tamriel is threatened by a mysterious floating city, Umbriel, whose shadow spawns a terrifying undead army. Reeling from a devastating discovery, Prince Attrebus continues on his seemingly doomed quest to obtain a magic sword that holds the key to destroying the deadly invaders. Meanwhile, in the Imperial City, the spy Colin finds evidence of betrayal at the heart of the empire--if his own heart...