Kil'jaeden is a prominent character in the Warcraft universe, known as one of the leaders of the Burning Legion. He is a powerful Eredar warlock and serves as a lieutenant to Sargeras, the dark titan. Kil'jaeden is often associated with manipulation and deceit, using his cunning to achieve the Legion's goals. Throughout the lore, Kil'jaeden plays a significant role in the corruption of various races, including the Draenei. He is responsible for the creation of the Lich King and has been involved in numerous conflicts against the forces of Azeroth. His ambition and power make him a formidable antagonist in the series.