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It is hard to classify a "demon lord", but the following individuals should be considered based on power level and rank in comparison to other demons. It should be stressed that the title has only definitively been used in reference to Sargeras, Archimonde, Kil'jaeden, Mannoroth, and Kazzak.
"The Destroyer", "the Fallen", "the Dark Titan", "the Great Enemy of all life", "the Ravager of Worlds", "the great dark god of the Nameless Void", "the Lord of the Legion", "the Daemonlord"W2Man 31, 33, 35, 39, 66, 69, "demon lord"LoM 69LG 248