The Lich King is a central character in the lore of the Warcraft universe, primarily known from the video game series World of Warcraft. He is the ruler of the undead Scourge and wields immense power through the cursed sword Frostmourne. The Lich King was originally the paladin Arthas Menethil, who became corrupted by his desire for power and ultimately merged with the spirit of the previous Lich King, Ner'zhul. As the Lich King, he commands legions of undead and seeks to conquer the living. His story is a key part of the Wrath of the Lich King expansion, where players confront him in a climactic battle. The character symbolizes themes of ambition, corruption, and the struggle between life and death within the Warcraft narrative.