The sole source of misery and negative emotions in the Slayers world, Ruby-Eye Shabranigdo is the superior of all other Mazoku. Defeated long ago by the Dragon King Ceiphied, Ruby-Eye was split into seven parts and buried in human souls. It was Ceiphied's plan to wear away at these fragments by the constant death and rebirth of human lives, until Shabranigdo ceased to be. A thousand years ago, one of these parts awakened in the legendary sorcerer Lei Magnus, the Demon King of the North, who was defeated by the Sea Dragon King Ragradia. Lei Magnus was a great sage who created devastating spells such as Lina's infamous Dragon Slave and the powerful fire shamanistic spell Blast Bomb. However, his power came at a price for he was an incarnate of one of the Seven pieces of the Demon King Ruby Eye Shabranigdo and once awakened, he led the mazoku against the dragon kings, but was sealed away in ice forever by Aqualord Ragradia.