User blog comment:BlackWizardZeref/Theories on "God Slaying" Magic/@comment-24066070-20131101083700/@comment-4829046-20131101140202

And Chelia was a genius and learned it by studying the book given to her by Gran Doma like a boss. It wouldn't make sense for her idiot cousin to be able to learn it :/ Also her cousin already had a magic at the time so she wouldn't be able to anyway. You are not critiquing, you are hating. But I do see your argument. God Slayer Magic is so useless in the series, especially since Chelia, the only one who can actually use it for super healing is only a side character and was just one-shotted by Juvia and Gray, completely ruining everything.