User blog comment:Ultraprime2/My 10 Most Disappointing Characters in Fairy Tail/@comment-24066070-20131123164201/@comment-24066070-20131123173143

Yeah lol Vidaldus' magic was never stated to only work on women, perhaps he can turn everyone into his slave.

Such magic, if used correctly, would normally belong to the final boss of a series as it could be really overpowered depending on where the author puts the limitations. Other magics this applies to are Freed's, Bickslow's and Rufus' magic, perhaps that's why they hardly get involved in a fight.