Ruby Eye Shabranigdo 赤眼の魔王（ルビーアイ）シャブラニグドゥ,

The Demon God of the Slayers Series, Ruby Eye Shabranigdo is the God of Evil, the King of Darkness, the creator of demons and monsters and to cut a long story short, the direct or indirect cause of everything bad in the Slayers World. He feasts on negative emotions and wishes to destroy the world, so that the demon kind could dwell in the Sea of Chaos: the source of all creation. Since he was divided into seven fragments and put into slumber by his archenemy the Dragon God Ceifeed, every demon seeks to either awake him, or to destroy the world on his behalf.