Demise and Ruin

Demise and Ruin are two line-ups of Ritual Monsters (one of DARK Fiends and the other of female LIGHT Fairies), that originally debuted in Shadow of Infinity and were later expanded in Cybernetic Horizon. The original monsters of the theme—"Demise, King of Armageddon" and "Ruin, Queen of Oblivion"—were unique in that they consisted in a Ritual Spell Card, "End of the World", that specifically listed both of the otherwise-separate Ritual Monsters.