Frostmourne is a legendary sword from the video game series World of Warcraft. It is known for its icy appearance and powerful abilities, which allow it to drain the life force of its enemies. The sword is closely associated with the character Arthas Menethil, who becomes the Lich King after wielding it. Forged by the Ner'zhul, the original Lich King, Frostmourne is imbued with dark magic. It plays a significant role in the game's lore, symbolizing the corruption and loss of humanity that comes with the pursuit of power. The sword's influence extends throughout the Warcraft universe, impacting many characters and events.