Rhapthorne
Lord Rhapthorne is the central antagonist of Dragon Quest VIII. A demon of untold legend, Rhapthorne is the party's final opponent in their quest to rid the world of an evil curse.
Rhapthorne had power over the World of Darkness, but he planned to take control of the World of Light, but was stopped by the Seven Sages with the help of Empyrea, the Godbird. He returned centuries later to kill the heirs of Seven Sages and take over the World of Light.
Rhapthorne also appears as a Legacy Boss in Dragon Quest IX.