World of Warcraft: Arthas. Rise of the Lich King

His malice became legend. The lord of all undead of the Scourge, the master of the runeblade Frostmourne, an irreconcilable enemy of all free peoples of Azeroth, the Lich King - a being of immeasurable power and unmatched cruelty, whose icy soul is entirely consumed by the desire to destroy all life in World of Warcraft.
.But it was not always so. Before the orc shaman Ner'zhul infected his soul with the thirst for murder, the Lich King was Prince Arthas Menethil, heir to the throne of Lordaeron and a loyal paladin of the Silver Hand.
.When a plague broke out in northern Lordaeron, turning the living into the undead and bringing doom to all he knew and loved, Arthas embarked on a hopeless quest for the runeblade, endowed with the power to save his homeland. However, the object of his search demands an incredible sacrifice from its new master. With its acquisition, a terrible descent into the abyss of curse begins for Arthas. Now the path of the prince of Lordaeron leads to the freezing northern wastelands to the Frozen Throne - and towards the darkest fate in the world.