Board Thread:News and Announcements/@comment-3030647-20160926104712/@comment-30807545-20160926182906

On a related note:

"Hiro Mashima designed all of the Spriggan 12 with the idea that they all would possess "cheating magics"—abilities that an author considers something that destroy the framework of the story, even admitting he struggled against deciding to use them—most specifically mentioning Age Seal (Dimaria's primary Magic) and Historia of the Dead (Neinhart's primary Magic) were the ones he was torn about, but eventually convinced himself to use them"

- Fairy Tail Volume 56: Afterword

Explains a lot actually.