User blog comment:SethHeartphilia/Whos stronger Erza or Mirajane/@comment-121.54.58.147-20140511153615/@comment-112.198.204.222-20140916183654

well the hammer only works if the intention of the user of the magic is truly evil, but as Mira said in her battle on one of the executioners, using Dark magic doesn't mean that she's evil, thus she her magic can't be judged as evil magic