User blog comment:Miskos3/Fairy Tail Chapter 391: Gray vs. Silver, Review/@comment-7418318-20140704072547

Overall a fantastic chapter, but I have one problem and it's slayer magic.

So Deliora just went and learned a kind of slayer magic? Did he also learn it from a book or what? Is it really so easy to learn this kind of extremely powerful magic now?

First you needed to have a Dragon teach you or have extremely rare Lacrima implanet. Then came the God Slayers who learned it from books, but at least you needed to either have a great teacher (Zancrow - Hades) or be very talented (Chelia).

And now Deliora just mentioned that he learned a Slayer magic and not just any, but the very one he needed against his chosen enemy as if it was nothing special. He didn't even say he had to search long or work hard to learn it or anything. It's as if any idiot could learn Slayer magic of some kind now.