User blog comment:IamJakuhoRaikoben/Chapter 405: Tartarus Arc: Part 6 - Magna Carta, Review./@comment-24622358-20141022001341/@comment-207.160.210.133-20141022182540

I doubt it is Zeira or Mavis just because it would conflict with Fairy Tail Zero and the Story progress. I doubt it is the Tenrou Jade because we don't even know about it within Fairy Tail Zero which is basically one of the Mysterious and Plot lines within Fairy Tail Zero so if it was to be revealed here then what would be the point in watching Fairy Tail Zero.

We don't even know if the next chapter is refering to LH it could be something that was in Plutogrim.