User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-4507125-20161231163540/@comment-14772371-20161231165915

It has always seemed a bit odd to me that bathing in dragon blood would cause dragonification. As I understand it, once a person is infused with dragon particles, he becomes able to use the lost magic of Dragon Slayer Magic. Those dragon particles keep growing. It makes more sense to me it's the exercising of dragon slayer magic that speeds up the process, as in the case of Acnologia.