Curse of Darkness is set in the year 1479, three years after the events of Castlevania III: Dracula’s Curse. Though defeated by vampire hunter Trevor Belmont, Dracula’s curse continues to ravage the European countryside, spreading disease, mob violence, and heresy in its wake. Amidst all this devastation is Hector, a Devil Forgemaster who had formerly worked under the employ of Dracula but betrayed him sometime during the events of Castlevania III. Eventually growing disgusted with Dracula’s brutal methods, Hector leaves Castlevania and relinquishes his powers to live amongst humans, settling down to live a peaceful life. When Hector’s fiance Rosaly is accused of witchcraft and burned at the stake, Hector learns that her murder was directed by his fellow Forgemaster, Isaac. Seeking revenge, Hector chases his former colleague back to his old home, and back to the demonic life he believed he had left behind him.