Kel'Thuzad
Kel'Thuzad is a powerful lich and a key character in the Warcraft universe. Originally a human mage, he became a servant of the Lich King after seeking forbidden knowledge. His transformation into a lich granted him immense magical abilities and immortality, but at the cost of his humanity.
As a prominent figure in the Scourge, Kel'Thuzad played a crucial role in the Third War. He is best known for his leadership in the Naxxramas necropolis, where he commanded undead forces and sought to spread the influence of the Lich King across Azeroth.