Feior is a powerful sorcerous overlord, who serves as the main villain in the Fighting Fantasy gamebook Black Vein Prophecy, unique among the series' gamebooks for the deep background of its playable character. Feior is the twin brother of the playable character Maior. Both brothers were put into a magical slumber by their father, the vile tyrant Bezenvial, so that one of them would take back his endangered throne upon awaking.